diff --git a/src/google/protobuf/repeated_ptr_field.h b/src/google/protobuf/repeated_ptr_field.h
index d9d8d8fb4c..d38232462e 100644
--- a/src/google/protobuf/repeated_ptr_field.h
+++ b/src/google/protobuf/repeated_ptr_field.h
@@ -863,7 +863,7 @@ void RepeatedPtrFieldBase::MergeFrom<std::string>(
     const RepeatedPtrFieldBase& from);
 
 
-void InternalOutOfLineDeleteMessageLite(MessageLite* message);
+PROTOBUF_EXPORT void InternalOutOfLineDeleteMessageLite(MessageLite* message);
 
 template <typename GenericType>
 class GenericTypeHandler {