diff --git a/python/setup.py b/python/setup.py
index a202670..70b7de5 100755
--- a/python/setup.py
+++ b/python/setup.py
@@ -80,6 +80,7 @@
   generate_proto("../src/google/protobuf/any_test.proto", False)
   generate_proto("../src/google/protobuf/map_unittest.proto", False)
   generate_proto("../src/google/protobuf/test_messages_proto3.proto", False)
+  generate_proto("../src/google/protobuf/test_messages_proto2.proto", False)
   generate_proto("../src/google/protobuf/unittest_arena.proto", False)
   generate_proto("../src/google/protobuf/unittest_no_arena.proto", False)
   generate_proto("../src/google/protobuf/unittest_no_arena_import.proto", False)