diff --git a/src/google/protobuf/any.h b//src/google/protobuf/any.h
index d688a0ca738fa..9666389a6b22f 100644
--- a/src/google/protobuf/any.h
+++ b/src/google/protobuf/any.h
@@ -48,9 +48,9 @@ class Message;
namespace internal {
-extern const char kAnyFullTypeName[]; // "google.protobuf.Any".
-extern const char kTypeGoogleApisComPrefix[]; // "type.googleapis.com/".
-extern const char kTypeGoogleProdComPrefix[]; // "type.googleprod.com/".
+PROTOBUF_EXPORT extern const char kAnyFullTypeName[]; // "google.protobuf.Any".
+PROTOBUF_EXPORT extern const char kTypeGoogleApisComPrefix[]; // "type.googleapis.com/".
+PROTOBUF_EXPORT extern const char kTypeGoogleProdComPrefix[]; // "type.googleprod.com/".
std::string GetTypeUrl(StringPiece message_name,
StringPiece type_url_prefix);