diff --git a/quic/core/quic_connection.h b/quic/core/quic_connection.h
index 8e3608b..7339b57 100644
--- a/quic/core/quic_connection.h
+++ b/quic/core/quic_connection.h
@@ -1670,6 +1670,9 @@
 
   bool blackhole_detection_disabled_ = false;
 
+  // True if this connection supports handshake done frame.
+  bool support_handshake_done_;
+
   const bool use_idle_network_detector_ =
       GetQuicReloadableFlag(quic_use_idle_network_detector);