diff --git a/protobuf-c/protobuf-c.c b/protobuf-c/protobuf-c.c
index d31c589..cc698c4 100644
--- a/protobuf-c/protobuf-c.c
+++ b/protobuf-c/protobuf-c.c
@@ -388,7 +388,7 @@ repeated_field_get_packed_size(const ProtobufCFieldDescriptor *field,
 	if (count == 0)
 		return 0;
 	header_size = get_tag_size(field->id);
-	if (0 == (field->flags & PROTOBUF_C_FIELD_FLAGS_PACKED))
+	if (0 == (field->flags & PROTOBUF_C_FIELD_FLAG_PACKED))
 		header_size *= count;
 
 	switch (field->type) {
@@ -449,7 +449,7 @@ repeated_field_get_packed_size(const ProtobufCFieldDescriptor *field,
 	/* case PROTOBUF_C_TYPE_GROUP: -- NOT SUPPORTED */
 	}
 
-	if (0 != (field->flags & PROTOBUF_C_FIELD_FLAGS_PACKED))
+	if (0 != (field->flags & PROTOBUF_C_FIELD_FLAG_PACKED))
 		header_size += uint32_size(rv);
 	return header_size + rv;
 }
@@ -872,7 +872,7 @@ repeated_field_pack(const ProtobufCFieldDescriptor *field,
 	void *array = *(void * const *) member;
 	unsigned i;
 
-	if (0 != (field->flags & PROTOBUF_C_FIELD_FLAGS_PACKED)) {
+	if (0 != (field->flags & PROTOBUF_C_FIELD_FLAG_PACKED)) {
 		unsigned header_len;
 		unsigned len_start;
 		unsigned min_length;
@@ -1300,7 +1300,7 @@ repeated_field_pack_to_buffer(const ProtobufCFieldDescriptor *field,
 
 	if (count == 0)
 		return 0;
-	if (0 != (field->flags & PROTOBUF_C_FIELD_FLAGS_PACKED)) {
+	if (0 != (field->flags & PROTOBUF_C_FIELD_FLAG_PACKED)) {
 		uint8_t scratch[MAX_UINT64_ENCODED_SIZE * 2];
 		size_t rv = tag_pack(field->id, scratch);
 		size_t payload_len = get_packed_payload_length(field, count, array);
@@ -2169,7 +2169,8 @@ parse_member(ScannedMember *scanned_member,
 	case PROTOBUF_C_LABEL_REPEATED:
 		if (scanned_member->wire_type ==
 		    PROTOBUF_C_WIRE_TYPE_LENGTH_PREFIXED &&
-		    (0 != (field->flags & PROTOBUF_C_FIELD_FLAGS_PACKED) || is_packable_type(field->type)))
+		    (0 != (field->flags & PROTOBUF_C_FIELD_FLAG_PACKED) ||
+		     is_packable_type(field->type)))
 		{
 			return parse_packed_repeated_member(scanned_member,
 							    member, message);
@@ -2446,7 +2447,8 @@ protobuf_c_message_unpack(const ProtobufCMessageDescriptor *desc,
 			size_t *n = STRUCT_MEMBER_PTR(size_t, rv,
 						      field->quantifier_offset);
 			if (wire_type == PROTOBUF_C_WIRE_TYPE_LENGTH_PREFIXED &&
-			    (0 != (field->flags & PROTOBUF_C_FIELD_FLAGS_PACKED) || is_packable_type(field->type)))
+			    (0 != (field->flags & PROTOBUF_C_FIELD_FLAG_PACKED) ||
+			     is_packable_type(field->type)))
 			{
 				size_t count;
 				if (!count_packed_elements(field->type,
diff --git a/protobuf-c/protobuf-c.h b/protobuf-c/protobuf-c.h
index dcbb4ac..18f18c0 100644
--- a/protobuf-c/protobuf-c.h
+++ b/protobuf-c/protobuf-c.h
@@ -228,8 +228,8 @@ typedef void (*ProtobufCMessageInit)(ProtobufCMessage *);
  *        otherwise NULL.
  * 'default_value' is a pointer to a default value for this field,
  *        where allowed.
- * 'packed' is only for REPEATED fields (it is 0 otherwise); this is if
- *        the repeated fields is marked with the 'packed' options.
+ * 'flags' is a flag word. Zero or more of the bits defined in the
+ *        ProtobufCFieldFlag enum may be set.
  */
 struct _ProtobufCFieldDescriptor {
 	const char		*name;
@@ -240,7 +240,7 @@ struct _ProtobufCFieldDescriptor {
 	unsigned		offset;
 	const void		*descriptor; /* for MESSAGE and ENUM types */
 	const void		*default_value; /* can be NULL */
-	unsigned		flags;
+	uint32_t		flags;
 
 	unsigned		reserved_flags;
 	void			*reserved2;
@@ -248,8 +248,9 @@ struct _ProtobufCFieldDescriptor {
 };
 
 typedef enum {
-	PROTOBUF_C_FIELD_FLAGS_PACKED		= (1 << 0),
-} ProtobufCFieldFlagType;
+	/* Set if the field is repeated and marked with the 'packed' option. */
+	PROTOBUF_C_FIELD_FLAG_PACKED		= (1 << 0),
+} ProtobufCFieldFlag;
 
 /*
  * ProtobufCMessageDescriptor: description of a message.
diff --git a/protoc-c/c_field.cc b/protoc-c/c_field.cc
index 847f125..cb7737d 100644
--- a/protoc-c/c_field.cc
+++ b/protoc-c/c_field.cc
@@ -128,7 +128,7 @@ void FieldGenerator::GenerateDescriptorInitializerGeneric(io::Printer* printer,
   if (descriptor_->label() == FieldDescriptor::LABEL_REPEATED
    && is_packable_type (descriptor_->type())
    && descriptor_->options().packed())
-    variables["flags"] += " | PROTOBUF_C_FIELD_FLAGS_PACKED";
+    variables["flags"] += " | PROTOBUF_C_FIELD_FLAG_PACKED";
 
   printer->Print(variables,
     "{\n"