diff --git a/quic/core/session_notifier_interface.h b/quic/core/session_notifier_interface.h
index 83fc0f1..a601c3e 100644
--- a/quic/core/session_notifier_interface.h
+++ b/quic/core/session_notifier_interface.h
@@ -19,7 +19,8 @@
   // Called when |frame| is acked. Returns true if any new data gets acked,
   // returns false otherwise.
   virtual bool OnFrameAcked(const QuicFrame& frame,
-                            QuicTime::Delta ack_delay_time) = 0;
+                            QuicTime::Delta ack_delay_time,
+                            QuicTime receive_timestamp) = 0;
 
   // Called when |frame| is retransmitted.
   virtual void OnStreamFrameRetransmitted(const QuicStreamFrame& frame) = 0;