diff --git a/quic/quartc/quartc_session.h b/quic/quartc/quartc_session.h
index 042827b..cd8d2cb 100644
--- a/quic/quartc/quartc_session.h
+++ b/quic/quartc/quartc_session.h
@@ -176,7 +176,8 @@
   void OnMessageReceived(QuicStringPiece message) override;
 
   // Called when message with |message_id| gets acked.
-  void OnMessageAcked(QuicMessageId message_id) override;
+  void OnMessageAcked(QuicMessageId message_id,
+                      QuicTime receive_timestamp) override;
 
   // Returns number of queued (not sent) messages submitted by
   // SendOrQueueMessage. Messages are queued if connection is congestion