diff --git a/api/peer_connection_interface.h b/api/peer_connection_interface.h
index 6cf6dbb..0e6cd5c 100644
--- a/api/peer_connection_interface.h
+++ b/api/peer_connection_interface.h
@@ -640,6 +640,9 @@
     // Whether network condition based codec switching is allowed.
     absl::optional<bool> allow_codec_switching;
 
+    // The delay before doing a usage histogram report for long-lived
+    // PeerConnections. Used for testing only.
+    absl::optional<int> report_usage_pattern_delay_ms;
     //
     // Don't forget to update operator== if adding something.
     //