1 files changed, 1 insertions, 1 deletions
diff --git a/src/google/protobuf/util/json_util.h b/src/google/protobuf/util/json_util.h
index b1c69813..e7868307 100644
--- a/src/google/protobuf/util/json_util.h
+++ b/src/google/protobuf/util/json_util.h
@@ -182,7 +182,7 @@ class LIBPROTOBUF_EXPORT ZeroCopyStreamByteSink : public strings::ByteSink {
       : stream_(stream), buffer_(NULL), buffer_size_(0) {}
   ~ZeroCopyStreamByteSink();
 
-  virtual void Append(const char* bytes, size_t len);
+  virtual void Append(const char* bytes, size_t len) override;
 
  private:
   io::ZeroCopyOutputStream* stream_;