diff --git a/src/node_http2.h b/src/node_http2.h
index 91a04e00f4a96c..9ac1f447eb1621 100644
--- a/src/node_http2.h
+++ b/src/node_http2.h
@@ -444,7 +444,7 @@ class Http2Session : public AsyncWrap,
                   const SubmitTrailers& submit_trailers) override;
 
   void Send(WriteWrap* req, char* buf, size_t length) override;
-  WriteWrap* AllocateSend();
+  WriteWrap* AllocateSend() override;
 
   int DoWrite(WriteWrap* w, uv_buf_t* bufs, size_t count,
               uv_stream_t* send_handle) override;