diff --git a/protobuf-test/src/common/v2/test_map_simple_pb.proto b/protobuf-test/src/common/v2/test_map_simple_pb.proto
index a9ffbcdf5..9a3b2264d 100644
--- a/protobuf-test/src/common/v2/test_map_simple_pb.proto
+++ b/protobuf-test/src/common/v2/test_map_simple_pb.proto
@@ -1,10 +1,20 @@
 syntax = "proto2";
 
+package test_map_simple;
+
+
 message TestMap {
     map<string, int32> m = 1;
     map<string, TestMapEntry> mm = 2;
+    // just check it compiles
+    map<fixed64, TestMapEnum> me = 3;
 }
 
 message TestMapEntry {
     optional int64 v = 1;
 }
+
+enum TestMapEnum {
+    UNKNOWN = 0;
+    ONE = 1;
+}