diff --git a/quic/core/session_notifier_interface.h b/quic/core/session_notifier_interface.h
index a601c3e..89b4a9c 100644
--- a/quic/core/session_notifier_interface.h
+++ b/quic/core/session_notifier_interface.h
@@ -37,6 +37,9 @@
 
   // Returns true if crypto stream is waiting for acks.
   virtual bool HasUnackedCryptoData() const = 0;
+
+  // Returns true if any stream is waiting for acks.
+  virtual bool HasUnackedStreamData() const = 0;
 };
 
 }  // namespace quic