diff --git a/minidump/minidump_file_writer.cc b/minidump/minidump_file_writer.cc
index 4ee1bd07..8e67db06 100644
--- a/minidump/minidump_file_writer.cc
+++ b/minidump/minidump_file_writer.cc
@@ -150,8 +150,8 @@ bool MinidumpFileWriter::WriteObject(FileWriterInterface* file_writer) {
   std::vector<WritableIoVec> iovecs(1, iov);
 
   for (internal::MinidumpStreamWriter* stream : streams_) {
-    iov.iov_len = sizeof(MINIDUMP_DIRECTORY);
     iov.iov_base = stream->DirectoryListEntry();
+    iov.iov_len = sizeof(MINIDUMP_DIRECTORY);
     iovecs.push_back(iov);
   }
 
diff --git a/minidump/minidump_memory_writer.cc b/minidump/minidump_memory_writer.cc
index cd8d33e4..5857dbcf 100644
--- a/minidump/minidump_memory_writer.cc
+++ b/minidump/minidump_memory_writer.cc
@@ -163,8 +163,8 @@ bool MinidumpMemoryListWriter::WriteObject(FileWriterInterface* file_writer) {
   std::vector<WritableIoVec> iovecs(1, iov);
 
   for (const MinidumpMemoryWriter* memory_writer : memory_writers_) {
-    iov.iov_len = sizeof(MINIDUMP_MEMORY_DESCRIPTOR);
     iov.iov_base = memory_writer->MinidumpMemoryDescriptor();
+    iov.iov_len = sizeof(MINIDUMP_MEMORY_DESCRIPTOR);
     iovecs.push_back(iov);
   }
 
diff --git a/minidump/minidump_module_writer.cc b/minidump/minidump_module_writer.cc
index d674760f..76521554 100644
--- a/minidump/minidump_module_writer.cc
+++ b/minidump/minidump_module_writer.cc
@@ -154,7 +154,6 @@ bool MinidumpModuleMiscDebugRecordWriter::WriteObject(
   iov.iov_len = base_length;
   std::vector<WritableIoVec> iovecs(1, iov);
 
-  iov.iov_len = image_debug_misc_.Length - base_length;
   if (!image_debug_misc_.Unicode) {
     DCHECK(data_utf16_.empty());
     iov.iov_base = &data_[0];
@@ -162,6 +161,7 @@ bool MinidumpModuleMiscDebugRecordWriter::WriteObject(
     DCHECK(data_.empty());
     iov.iov_base = &data_utf16_[0];
   }
+  iov.iov_len = image_debug_misc_.Length - base_length;
   iovecs.push_back(iov);
 
   return file_writer->WriteIoVec(&iovecs);
@@ -358,8 +358,8 @@ bool MinidumpModuleListWriter::WriteObject(FileWriterInterface* file_writer) {
   std::vector<WritableIoVec> iovecs(1, iov);
 
   for (const MinidumpModuleWriter* module : modules_) {
-    iov.iov_len = sizeof(MINIDUMP_MODULE);
     iov.iov_base = module->MinidumpModule();
+    iov.iov_len = sizeof(MINIDUMP_MODULE);
     iovecs.push_back(iov);
   }
 
diff --git a/minidump/minidump_simple_string_dictionary_writer.cc b/minidump/minidump_simple_string_dictionary_writer.cc
index d9a5c919..0b47cf8b 100644
--- a/minidump/minidump_simple_string_dictionary_writer.cc
+++ b/minidump/minidump_simple_string_dictionary_writer.cc
@@ -144,12 +144,10 @@ bool MinidumpSimpleStringDictionaryWriter::WriteObject(
   iov.iov_len = sizeof(simple_string_dictionary_base_);
   std::vector<WritableIoVec> iovecs(1, iov);
 
-  if (!entries_.empty()) {
+  for (const auto& key_entry : entries_) {
+    iov.iov_base = key_entry.second->MinidumpSimpleStringDictionaryEntry();
     iov.iov_len = sizeof(MinidumpSimpleStringDictionaryEntry);
-    for (const auto& key_entry : entries_) {
-      iov.iov_base = key_entry.second->MinidumpSimpleStringDictionaryEntry();
-      iovecs.push_back(iov);
-    }
+    iovecs.push_back(iov);
   }
 
   return file_writer->WriteIoVec(&iovecs);
diff --git a/minidump/minidump_thread_writer.cc b/minidump/minidump_thread_writer.cc
index 8f0e0856..e2392322 100644
--- a/minidump/minidump_thread_writer.cc
+++ b/minidump/minidump_thread_writer.cc
@@ -164,8 +164,8 @@ bool MinidumpThreadListWriter::WriteObject(FileWriterInterface* file_writer) {
   std::vector<WritableIoVec> iovecs(1, iov);
 
   for (const MinidumpThreadWriter* thread : threads_) {
-    iov.iov_len = sizeof(MINIDUMP_THREAD);
     iov.iov_base = thread->MinidumpThread();
+    iov.iov_len = sizeof(MINIDUMP_THREAD);
     iovecs.push_back(iov);
   }