diff --git a/src/Makefile.am b/src/Makefile.am
index b1fb1244..b39917e1 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -126,7 +126,6 @@ libprotobuf_lite_la_SOURCES =                                  \
   google/protobuf/arenastring.cc                               \
   google/protobuf/extension_set.cc                             \
   google/protobuf/generated_message_util.cc                    \
-  google/protobuf/map_field.cc                                 \
   google/protobuf/message_lite.cc                              \
   google/protobuf/repeated_field.cc                            \
   google/protobuf/wire_format_lite.cc                          \
@@ -150,6 +149,7 @@ libprotobuf_la_SOURCES =                                       \
   google/protobuf/dynamic_message.cc                           \
   google/protobuf/extension_set_heavy.cc                       \
   google/protobuf/generated_message_reflection.cc              \
+  google/protobuf/map_field.cc                                 \
   google/protobuf/message.cc                                   \
   google/protobuf/reflection_internal.h                        \
   google/protobuf/reflection_ops.cc                            \
diff --git a/vsprojects/libprotobuf-lite.vcproj b/vsprojects/libprotobuf-lite.vcproj
index 4859eec0..09eca4d8 100644
--- a/vsprojects/libprotobuf-lite.vcproj
+++ b/vsprojects/libprotobuf-lite.vcproj
@@ -283,10 +283,6 @@
 				RelativePath="..\src\google\protobuf\generated_message_util.cc"
 				>
 			</File>
-			<File
-				RelativePath="..\src\google\protobuf\map_field.cc"
-				>
-			</File>
 			<File
 				RelativePath="..\src\google\protobuf\message_lite.cc"
 				>