diff --git a/src/google/protobuf/util/time_util.h b/src/google/protobuf/util/time_util.h
index 67c8fed..f642c13 100644
--- a/src/google/protobuf/util/time_util.h
+++ b/src/google/protobuf/util/time_util.h
@@ -26,6 +26,9 @@ namespace google {
 namespace protobuf {
 namespace util {
 
+#undef PROTOBUF_EXPORT
+#define PROTOBUF_EXPORT
+
 // Utility functions for Timestamp and Duration.
 class PROTOBUF_EXPORT TimeUtil {
   typedef google::protobuf::Timestamp Timestamp;