diff --git a/protobuf-c/protobuf-c.proto b/protobuf-c/protobuf-c.proto
index 1da934f..c8a2d1e 100644
--- a/protobuf-c/protobuf-c.proto
+++ b/protobuf-c/protobuf-c.proto
@@ -52,6 +52,9 @@ message ProtobufCFileOptions {
     // For oneof fields, set ProtobufCFieldDescriptor name field to the
     // name of the containing oneof, instead of the field name
     optional bool use_oneof_field_name = 5 [default = false];
+
+    // Overrides the package name, if present
+    optional string c_package = 6;
 }
 
 extend google.protobuf.FileOptions {
diff --git a/protoc-c/c_bytes_field.cc b/protoc-c/c_bytes_field.cc
index 7e35ea2..e4a69ca 100644
--- a/protoc-c/c_bytes_field.cc
+++ b/protoc-c/c_bytes_field.cc
@@ -114,7 +114,7 @@ void BytesFieldGenerator::GenerateStructMembers(io::Printer* printer) const
 void BytesFieldGenerator::GenerateDefaultValueDeclarations(io::Printer* printer) const
 {
   std::map<std::string, std::string> vars;
-  vars["default_value_data"] = FullNameToLower(descriptor_->full_name())
+  vars["default_value_data"] = FullNameToLower(descriptor_->full_name(), descriptor_->file())
 	                     + "__default_value_data";
   printer->Print(vars, "extern uint8_t $default_value_data$[];\n");
 }
@@ -122,7 +122,7 @@ void BytesFieldGenerator::GenerateDefaultValueDeclarations(io::Printer* printer)
 void BytesFieldGenerator::GenerateDefaultValueImplementations(io::Printer* printer) const
 {
   std::map<std::string, std::string> vars;
-  vars["default_value_data"] = FullNameToLower(descriptor_->full_name())
+  vars["default_value_data"] = FullNameToLower(descriptor_->full_name(), descriptor_->file())
 	                     + "__default_value_data";
   vars["escaped"] = CEscape(descriptor_->default_value_string());
   printer->Print(vars, "uint8_t $default_value_data$[] = \"$escaped$\";\n");
@@ -132,7 +132,7 @@ std::string BytesFieldGenerator::GetDefaultValue(void) const
   return "{ "
 	+ SimpleItoa(descriptor_->default_value_string().size())
 	+ ", "
-	+ FullNameToLower(descriptor_->full_name())
+	+ FullNameToLower(descriptor_->full_name(), descriptor_->file())
 	+ "__default_value_data }";
 }
 void BytesFieldGenerator::GenerateStaticInit(io::Printer* printer) const
diff --git a/protoc-c/c_enum.cc b/protoc-c/c_enum.cc
index 7438422..1342af5 100644
--- a/protoc-c/c_enum.cc
+++ b/protoc-c/c_enum.cc
@@ -82,9 +82,9 @@ EnumGenerator::~EnumGenerator() {}
 
 void EnumGenerator::GenerateDefinition(io::Printer* printer) {
   std::map<std::string, std::string> vars;
-  vars["classname"] = FullNameToC(descriptor_->full_name());
+  vars["classname"] = FullNameToC(descriptor_->full_name(), descriptor_->file());
   vars["shortname"] = descriptor_->name();
-  vars["uc_name"] = FullNameToUpper(descriptor_->full_name());
+  vars["uc_name"] = FullNameToUpper(descriptor_->full_name(), descriptor_->file());
 
   SourceLocation sourceLoc;
   descriptor_->GetSourceLocation(&sourceLoc);
@@ -98,7 +98,7 @@ void EnumGenerator::GenerateDefinition(io::Printer* printer) {
 
 
   vars["opt_comma"] = ",";
-  vars["prefix"] = FullNameToUpper(descriptor_->full_name()) + "__";
+  vars["prefix"] = FullNameToUpper(descriptor_->full_name(), descriptor_->file()) + "__";
   for (int i = 0; i < descriptor_->value_count(); i++) {
     vars["name"] = descriptor_->value(i)->name();
     vars["number"] = SimpleItoa(descriptor_->value(i)->number());
@@ -132,8 +132,8 @@ void EnumGenerator::GenerateDescriptorDeclarations(io::Printer* printer) {
   } else {
     vars["dllexport"] = dllexport_decl_ + " ";
   }
-  vars["classname"] = FullNameToC(descriptor_->full_name());
-  vars["lcclassname"] = FullNameToLower(descriptor_->full_name());
+  vars["classname"] = FullNameToC(descriptor_->full_name(), descriptor_->file());
+  vars["lcclassname"] = FullNameToLower(descriptor_->full_name(), descriptor_->file());
 
   printer->Print(vars,
     "extern $dllexport$const ProtobufCEnumDescriptor    $lcclassname$__descriptor;\n");
@@ -154,7 +154,7 @@ void EnumGenerator::GenerateValueInitializer(io::Printer *printer, int index)
     descriptor_->file()->options().optimize_for() ==
     FileOptions_OptimizeMode_CODE_SIZE;
   vars["enum_value_name"] = vd->name();
-  vars["c_enum_value_name"] = FullNameToUpper(descriptor_->full_name()) + "__" + vd->name();
+  vars["c_enum_value_name"] = FullNameToUpper(descriptor_->full_name(), descriptor_->file()) + "__" + vd->name();
   vars["value"] = SimpleItoa(vd->number());
   if (optimize_code_size)
     printer->Print(vars, "  { NULL, NULL, $value$ }, /* CODE_SIZE */\n");
@@ -184,8 +184,8 @@ static int compare_value_indices_by_name(const void *a, const void *b)
 void EnumGenerator::GenerateEnumDescriptor(io::Printer* printer) {
   std::map<std::string, std::string> vars;
   vars["fullname"] = descriptor_->full_name();
-  vars["lcclassname"] = FullNameToLower(descriptor_->full_name());
-  vars["cname"] = FullNameToC(descriptor_->full_name());
+  vars["lcclassname"] = FullNameToLower(descriptor_->full_name(), descriptor_->file());
+  vars["cname"] = FullNameToC(descriptor_->full_name(), descriptor_->file());
   vars["shortname"] = descriptor_->name();
   vars["packagename"] = descriptor_->file()->package();
   vars["value_count"] = SimpleItoa(descriptor_->value_count());
diff --git a/protoc-c/c_enum_field.cc b/protoc-c/c_enum_field.cc
index f06b1ef..661c9f5 100644
--- a/protoc-c/c_enum_field.cc
+++ b/protoc-c/c_enum_field.cc
@@ -78,9 +78,9 @@ void SetEnumVariables(const FieldDescriptor* descriptor,
                       std::map<std::string, std::string>* variables) {
 
   (*variables)["name"] = FieldName(descriptor);
-  (*variables)["type"] = FullNameToC(descriptor->enum_type()->full_name());
+  (*variables)["type"] = FullNameToC(descriptor->enum_type()->full_name(), descriptor->enum_type()->file());
   const EnumValueDescriptor* default_value = descriptor->default_value_enum();
-  (*variables)["default"] = FullNameToUpper(default_value->type()->full_name())
+  (*variables)["default"] = FullNameToUpper(default_value->type()->full_name(), default_value->type()->file())
                           + "__" + default_value->name();
   (*variables)["deprecated"] = FieldDeprecated(descriptor);
 }
@@ -138,7 +138,7 @@ void EnumFieldGenerator::GenerateStaticInit(io::Printer* printer) const
 
 void EnumFieldGenerator::GenerateDescriptorInitializer(io::Printer* printer) const
 {
-  std::string addr = "&" + FullNameToLower(descriptor_->enum_type()->full_name()) + "__descriptor";
+  std::string addr = "&" + FullNameToLower(descriptor_->enum_type()->full_name(), descriptor_->enum_type()->file()) + "__descriptor";
   GenerateDescriptorInitializerGeneric(printer, true, "ENUM", addr);
 }
 
diff --git a/protoc-c/c_field.cc b/protoc-c/c_field.cc
index 75afa39..0716744 100644
--- a/protoc-c/c_field.cc
+++ b/protoc-c/c_field.cc
@@ -110,7 +110,7 @@ void FieldGenerator::GenerateDescriptorInitializerGeneric(io::Printer* printer,
   const OneofDescriptor *oneof = descriptor_->containing_oneof();
   const ProtobufCFileOptions opt = descriptor_->file()->options().GetExtension(pb_c_file);
   variables["TYPE"] = type_macro;
-  variables["classname"] = FullNameToC(FieldScope(descriptor_)->full_name());
+  variables["classname"] = FullNameToC(FieldScope(descriptor_)->full_name(), FieldScope(descriptor_)->file());
   variables["name"] = FieldName(descriptor_);
   if (opt.use_oneof_field_name())
     variables["proto_name"] = oneof->name();
@@ -131,7 +131,7 @@ void FieldGenerator::GenerateDescriptorInitializerGeneric(io::Printer* printer,
 
   if (descriptor_->has_default_value()) {
     variables["default_value"] = std::string("&")
-                               + FullNameToLower(descriptor_->full_name())
+                               + FullNameToLower(descriptor_->full_name(), descriptor_->file())
 			       + "__default_value";
   } else if (FieldSyntax(descriptor_) == 3 &&
     descriptor_->type() == FieldDescriptor::TYPE_STRING) {
diff --git a/protoc-c/c_helpers.cc b/protoc-c/c_helpers.cc
index 7baa265..6fd0cd3 100644
--- a/protoc-c/c_helpers.cc
+++ b/protoc-c/c_helpers.cc
@@ -177,9 +177,23 @@ std::string ToCamel(const std::string &name) {
   return rv;
 }
 
-std::string FullNameToLower(const std::string &full_name) {
+std::string OverrideFullName(const std::string &full_name,
+			    const FileDescriptor *file) {
+  const ProtobufCFileOptions opt = file->options().GetExtension(pb_c_file);
+  if (!opt.has_c_package())
+    return full_name;
+
+  std::string new_name = opt.c_package();
+  if (file->package().empty())
+    new_name += ".";
+
+  return new_name + full_name.substr(file->package().length());
+}
+
+std::string FullNameToLower(const std::string &full_name,
+			    const FileDescriptor *file) {
   std::vector<std::string> pieces;
-  SplitStringUsing(full_name, ".", &pieces);
+  SplitStringUsing(OverrideFullName(full_name, file), ".", &pieces);
   std::string rv = "";
   for (unsigned i = 0; i < pieces.size(); i++) {
     if (pieces[i] == "") continue;
@@ -188,9 +202,10 @@ std::string FullNameToLower(const std::string &full_name) {
   }
   return rv;
 }
-std::string FullNameToUpper(const std::string &full_name) {
+std::string FullNameToUpper(const std::string &full_name,
+			    const FileDescriptor *file) {
   std::vector<std::string> pieces;
-  SplitStringUsing(full_name, ".", &pieces);
+  SplitStringUsing(OverrideFullName(full_name, file), ".", &pieces);
   std::string rv = "";
   for (unsigned i = 0; i < pieces.size(); i++) {
     if (pieces[i] == "") continue;
@@ -199,9 +214,10 @@ std::string FullNameToUpper(const std::string &full_name) {
   }
   return rv;
 }
-std::string FullNameToC(const std::string &full_name) {
+std::string FullNameToC(const std::string &full_name,
+			const FileDescriptor *file) {
   std::vector<std::string> pieces;
-  SplitStringUsing(full_name, ".", &pieces);
+  SplitStringUsing(OverrideFullName(full_name, file), ".", &pieces);
   std::string rv = "";
   for (unsigned i = 0; i < pieces.size(); i++) {
     if (pieces[i] == "") continue;
diff --git a/protoc-c/c_helpers.h b/protoc-c/c_helpers.h
index 6db45c1..7598a4e 100644
--- a/protoc-c/c_helpers.h
+++ b/protoc-c/c_helpers.h
@@ -121,11 +121,11 @@ std::string ToLower(const std::string &class_name);
 std::string ToUpper(const std::string &class_name);
 
 // full_name() to lowercase with underscores
-std::string FullNameToLower(const std::string &full_name);
-std::string FullNameToUpper(const std::string &full_name);
+std::string FullNameToLower(const std::string &full_name, const FileDescriptor *file);
+std::string FullNameToUpper(const std::string &full_name, const FileDescriptor *file);
 
 // full_name() to c-typename (with underscores for packages, otherwise camel case)
-std::string FullNameToC(const std::string &class_name);
+std::string FullNameToC(const std::string &class_name, const FileDescriptor *file);
 
 // Splits, indents, formats, and prints comment lines
 void PrintComment (io::Printer* printer, std::string comment);
diff --git a/protoc-c/c_message.cc b/protoc-c/c_message.cc
index 0f96688..37e8bf8 100755
--- a/protoc-c/c_message.cc
+++ b/protoc-c/c_message.cc
@@ -112,7 +112,7 @@ MessageGenerator::~MessageGenerator() {}
 void MessageGenerator::
 GenerateStructTypedef(io::Printer* printer) {
   printer->Print("typedef struct $classname$ $classname$;\n",
-                 "classname", FullNameToC(descriptor_->full_name()));
+                 "classname", FullNameToC(descriptor_->full_name(), descriptor_->file()));
 
   for (int i = 0; i < descriptor_->nested_type_count(); i++) {
     nested_generators_[i]->GenerateStructTypedef(printer);
@@ -138,9 +138,9 @@ GenerateStructDefinition(io::Printer* printer) {
   }
 
   std::map<std::string, std::string> vars;
-  vars["classname"] = FullNameToC(descriptor_->full_name());
-  vars["lcclassname"] = FullNameToLower(descriptor_->full_name());
-  vars["ucclassname"] = FullNameToUpper(descriptor_->full_name());
+  vars["classname"] = FullNameToC(descriptor_->full_name(), descriptor_->file());
+  vars["lcclassname"] = FullNameToLower(descriptor_->full_name(), descriptor_->file());
+  vars["ucclassname"] = FullNameToUpper(descriptor_->full_name(), descriptor_->file());
   vars["field_count"] = SimpleItoa(descriptor_->field_count());
   if (dllexport_decl_.empty()) {
     vars["dllexport"] = "";
@@ -154,7 +154,7 @@ GenerateStructDefinition(io::Printer* printer) {
     vars["opt_comma"] = ",";
 
     vars["oneofname"] = CamelToUpper(oneof->name());
-    vars["foneofname"] = FullNameToC(oneof->full_name());
+    vars["foneofname"] = FullNameToC(oneof->full_name(), oneof->file());
 
     printer->Print("typedef enum {\n");
     printer->Indent();
@@ -205,7 +205,7 @@ GenerateStructDefinition(io::Printer* printer) {
   for (int i = 0; i < descriptor_->oneof_decl_count(); i++) {
     const OneofDescriptor *oneof = descriptor_->oneof_decl(i);
     vars["oneofname"] = CamelToLower(oneof->name());
-    vars["foneofname"] = FullNameToC(oneof->full_name());
+    vars["foneofname"] = FullNameToC(oneof->full_name(), oneof->file());
 
     printer->Print(vars, "$foneofname$Case $oneofname$_case;\n");
 
@@ -245,7 +245,7 @@ GenerateStructDefinition(io::Printer* printer) {
   }
   for (int i = 0; i < descriptor_->oneof_decl_count(); i++) {
     const OneofDescriptor *oneof = descriptor_->oneof_decl(i);
-    vars["foneofname"] = FullNameToUpper(oneof->full_name());
+    vars["foneofname"] = FullNameToUpper(oneof->full_name(), oneof->file());
     // Initialize the case enum
     printer->Print(vars, ", $foneofname$__NOT_SET");
     // Initialize the union
@@ -278,8 +278,8 @@ GenerateHelperFunctionDeclarations(io::Printer* printer,
   }
 
   std::map<std::string, std::string> vars;
-  vars["classname"] = FullNameToC(descriptor_->full_name());
-  vars["lcclassname"] = FullNameToLower(descriptor_->full_name());
+  vars["classname"] = FullNameToC(descriptor_->full_name(), descriptor_->file());
+  vars["lcclassname"] = FullNameToLower(descriptor_->full_name(), descriptor_->file());
   if (gen_init) {
     printer->Print(vars,
 		 "/* $classname$ methods */\n"
@@ -312,7 +312,7 @@ GenerateHelperFunctionDeclarations(io::Printer* printer,
 void MessageGenerator::
 GenerateDescriptorDeclarations(io::Printer* printer) {
   printer->Print("extern const ProtobufCMessageDescriptor $name$__descriptor;\n",
-                 "name", FullNameToLower(descriptor_->full_name()));
+                 "name", FullNameToLower(descriptor_->full_name(), descriptor_->file()));
 
   for (int i = 0; i < descriptor_->nested_type_count(); i++) {
     nested_generators_[i]->GenerateDescriptorDeclarations(printer);
@@ -328,7 +328,7 @@ void MessageGenerator::GenerateClosureTypedef(io::Printer* printer)
     nested_generators_[i]->GenerateClosureTypedef(printer);
   }
   std::map<std::string, std::string> vars;
-  vars["name"] = FullNameToC(descriptor_->full_name());
+  vars["name"] = FullNameToC(descriptor_->full_name(), descriptor_->file());
   printer->Print(vars,
                  "typedef void (*$name$_Closure)\n"
 		 "                 (const $name$ *message,\n"
@@ -368,9 +368,9 @@ GenerateHelperFunctionDefinitions(io::Printer* printer,
   }
 
   std::map<std::string, std::string> vars;
-  vars["classname"] = FullNameToC(descriptor_->full_name());
-  vars["lcclassname"] = FullNameToLower(descriptor_->full_name());
-  vars["ucclassname"] = FullNameToUpper(descriptor_->full_name());
+  vars["classname"] = FullNameToC(descriptor_->full_name(), descriptor_->file());
+  vars["lcclassname"] = FullNameToLower(descriptor_->full_name(), descriptor_->file());
+  vars["ucclassname"] = FullNameToUpper(descriptor_->full_name(), descriptor_->file());
   vars["base"] = opt.base_field_name();
   if (gen_init) {
     printer->Print(vars,
@@ -430,8 +430,8 @@ void MessageGenerator::
 GenerateMessageDescriptor(io::Printer* printer, bool gen_init) {
     std::map<std::string, std::string> vars;
     vars["fullname"] = descriptor_->full_name();
-    vars["classname"] = FullNameToC(descriptor_->full_name());
-    vars["lcclassname"] = FullNameToLower(descriptor_->full_name());
+    vars["classname"] = FullNameToC(descriptor_->full_name(), descriptor_->file());
+    vars["lcclassname"] = FullNameToLower(descriptor_->full_name(), descriptor_->file());
     vars["shortname"] = ToCamel(descriptor_->name());
     vars["n_fields"] = SimpleItoa(descriptor_->field_count());
     vars["packagename"] = descriptor_->file()->package();
@@ -517,7 +517,7 @@ GenerateMessageDescriptor(io::Printer* printer, bool gen_init) {
 	case FieldDescriptor::CPPTYPE_ENUM:
 	  {
 	    const EnumValueDescriptor *vd = fd->default_value_enum();
-	    vars["field_dv_ctype"] = FullNameToC(vd->type()->full_name());
+	    vars["field_dv_ctype"] = FullNameToC(vd->type()->full_name(), vd->type()->file());
 	    break;
 	  }
 	default:
diff --git a/protoc-c/c_message_field.cc b/protoc-c/c_message_field.cc
index b57fcf5..16661bc 100644
--- a/protoc-c/c_message_field.cc
+++ b/protoc-c/c_message_field.cc
@@ -85,7 +85,7 @@ void MessageFieldGenerator::GenerateStructMembers(io::Printer* printer) const
 {
   std::map<std::string, std::string> vars;
   vars["name"] = FieldName(descriptor_);
-  vars["type"] = FullNameToC(descriptor_->message_type()->full_name());
+  vars["type"] = FullNameToC(descriptor_->message_type()->full_name(), descriptor_->message_type()->file());
   vars["deprecated"] = FieldDeprecated(descriptor_);
   switch (descriptor_->label()) {
     case FieldDescriptor::LABEL_REQUIRED:
@@ -119,7 +119,7 @@ void MessageFieldGenerator::GenerateStaticInit(io::Printer* printer) const
 }
 void MessageFieldGenerator::GenerateDescriptorInitializer(io::Printer* printer) const
 {
-  std::string addr = "&" + FullNameToLower(descriptor_->message_type()->full_name()) + "__descriptor";
+  std::string addr = "&" + FullNameToLower(descriptor_->message_type()->full_name(), descriptor_->message_type()->file()) + "__descriptor";
   GenerateDescriptorInitializerGeneric(printer, false, "MESSAGE", addr);
 }
 
diff --git a/protoc-c/c_service.cc b/protoc-c/c_service.cc
index 982cb3e..b1c24cc 100644
--- a/protoc-c/c_service.cc
+++ b/protoc-c/c_service.cc
@@ -74,9 +74,9 @@ ServiceGenerator::ServiceGenerator(const ServiceDescriptor* descriptor,
   : descriptor_(descriptor) {
   vars_["name"] = descriptor_->name();
   vars_["fullname"] = descriptor_->full_name();
-  vars_["cname"] = FullNameToC(descriptor_->full_name());
-  vars_["lcfullname"] = FullNameToLower(descriptor_->full_name());
-  vars_["ucfullname"] = FullNameToUpper(descriptor_->full_name());
+  vars_["cname"] = FullNameToC(descriptor_->full_name(), descriptor_->file());
+  vars_["lcfullname"] = FullNameToLower(descriptor_->full_name(), descriptor_->file());
+  vars_["ucfullname"] = FullNameToUpper(descriptor_->full_name(), descriptor_->file());
   vars_["lcfullpadd"] = ConvertToSpaces(vars_["lcfullname"]);
   vars_["package"] = descriptor_->file()->package();
   if (dllexport_decl.empty()) {
@@ -107,8 +107,8 @@ void ServiceGenerator::GenerateVfuncs(io::Printer* printer)
     std::string lcname = CamelToLower(method->name());
     vars_["method"] = lcname;
     vars_["metpad"] = ConvertToSpaces(lcname);
-    vars_["input_typename"] = FullNameToC(method->input_type()->full_name());
-    vars_["output_typename"] = FullNameToC(method->output_type()->full_name());
+    vars_["input_typename"] = FullNameToC(method->input_type()->full_name(), method->input_type()->file());
+    vars_["output_typename"] = FullNameToC(method->output_type()->full_name(), method->output_type()->file());
     printer->Print(vars_,
                    "  void (*$method$)($cname$_Service *service,\n"
                    "         $metpad$  const $input_typename$ *input,\n"
@@ -145,11 +145,11 @@ void ServiceGenerator::GenerateCallersDeclarations(io::Printer* printer)
   for (int i = 0; i < descriptor_->method_count(); i++) {
     const MethodDescriptor *method = descriptor_->method(i);
     std::string lcname = CamelToLower(method->name());
-    std::string lcfullname = FullNameToLower(descriptor_->full_name());
+    std::string lcfullname = FullNameToLower(descriptor_->full_name(), descriptor_->file());
     vars_["method"] = lcname;
     vars_["metpad"] = ConvertToSpaces(lcname);
-    vars_["input_typename"] = FullNameToC(method->input_type()->full_name());
-    vars_["output_typename"] = FullNameToC(method->output_type()->full_name());
+    vars_["input_typename"] = FullNameToC(method->input_type()->full_name(), method->input_type()->file());
+    vars_["output_typename"] = FullNameToC(method->output_type()->full_name(), method->output_type()->file());
     vars_["padddddddddddddddddd"] = ConvertToSpaces(lcfullname + "__" + lcname);
     printer->Print(vars_,
                    "void $lcfullname$__$method$(ProtobufCService *service,\n"
@@ -208,8 +208,8 @@ void ServiceGenerator::GenerateServiceDescriptor(io::Printer* printer)
   for (int i = 0; i < n_methods; i++) {
     const MethodDescriptor *method = descriptor_->method(i);
     vars_["method"] = method->name();
-    vars_["input_descriptor"] = "&" + FullNameToLower(method->input_type()->full_name()) + "__descriptor";
-    vars_["output_descriptor"] = "&" + FullNameToLower(method->output_type()->full_name()) + "__descriptor";
+    vars_["input_descriptor"] = "&" + FullNameToLower(method->input_type()->full_name(), method->input_type()->file()) + "__descriptor";
+    vars_["output_descriptor"] = "&" + FullNameToLower(method->output_type()->full_name(), method->output_type()->file()) + "__descriptor";
     if (optimize_code_size) {
       printer->Print(vars_,
           "  { NULL, $input_descriptor$, $output_descriptor$ }, /* CODE_SIZE */\n");
@@ -267,11 +267,11 @@ void ServiceGenerator::GenerateCallersImplementations(io::Printer* printer)
   for (int i = 0; i < descriptor_->method_count(); i++) {
     const MethodDescriptor *method = descriptor_->method(i);
     std::string lcname = CamelToLower(method->name());
-    std::string lcfullname = FullNameToLower(descriptor_->full_name());
+    std::string lcfullname = FullNameToLower(descriptor_->full_name(), descriptor_->file());
     vars_["method"] = lcname;
     vars_["metpad"] = ConvertToSpaces(lcname);
-    vars_["input_typename"] = FullNameToC(method->input_type()->full_name());
-    vars_["output_typename"] = FullNameToC(method->output_type()->full_name());
+    vars_["input_typename"] = FullNameToC(method->input_type()->full_name(), method->input_type()->file());
+    vars_["output_typename"] = FullNameToC(method->output_type()->full_name(), method->output_type()->file());
     vars_["padddddddddddddddddd"] = ConvertToSpaces(lcfullname + "__" + lcname);
     vars_["index"] = SimpleItoa(i);
 
diff --git a/protoc-c/c_string_field.cc b/protoc-c/c_string_field.cc
index 4fb42f7..80899e4 100644
--- a/protoc-c/c_string_field.cc
+++ b/protoc-c/c_string_field.cc
@@ -76,7 +76,7 @@ using internal::WireFormat;
 void SetStringVariables(const FieldDescriptor* descriptor,
                         std::map<std::string, std::string>* variables) {
   (*variables)["name"] = FieldName(descriptor);
-  (*variables)["default"] = FullNameToLower(descriptor->full_name())
+  (*variables)["default"] = FullNameToLower(descriptor->full_name(), descriptor->file())
 	+ "__default_value";
   (*variables)["deprecated"] = FieldDeprecated(descriptor);
 }
diff --git a/t/test.proto b/t/test.proto
index bda724e..884993c 100644
--- a/t/test.proto
+++ b/t/test.proto
@@ -1,5 +1,9 @@
 package foo;
 
+import "protobuf-c/protobuf-c.proto";
+
+option (pb_c_file).c_package = "foo";
+
 message Person {
   required string name = 1;
   required int32 id = 2;