diff --git a/quic/quartc/quartc_endpoint.h b/quic/quartc/quartc_endpoint.h
index da480fe..df6f056 100644
--- a/quic/quartc/quartc_endpoint.h
+++ b/quic/quartc/quartc_endpoint.h
@@ -88,7 +88,8 @@
                           ConnectionCloseSource source) override;
   void OnMessageReceived(QuicStringPiece message) override;
   void OnMessageSent(int64_t datagram_id) override;
-  void OnMessageAcked(int64_t datagram_id) override;
+  void OnMessageAcked(int64_t datagram_id, QuicTime receive_timestamp) override;
+  void OnMessageLost(int64_t datagram_id) override;
 
  private:
   friend class CreateSessionDelegate;