--- a/dom/tests/mochitest/general/test_interfaces.js
+++ b/dom/tests/mochitest/general/test_interfaces.js
@@ -812,16 +812,18 @@ var interfaceNamesInGlobalScope =
     "RTCPeerConnection",
 // IMPORTANT: Do not change this list without review from a DOM peer!
     "RTCPeerConnectionIceEvent",
 // IMPORTANT: Do not change this list without review from a DOM peer!
     "RTCRtpReceiver",
 // IMPORTANT: Do not change this list without review from a DOM peer!
     "RTCRtpSender",
 // IMPORTANT: Do not change this list without review from a DOM peer!
+    "RTCRtpTransceiver",
+// IMPORTANT: Do not change this list without review from a DOM peer!
     "RTCSessionDescription",
 // IMPORTANT: Do not change this list without review from a DOM peer!
     "RTCStatsReport",
 // IMPORTANT: Do not change this list without review from a DOM peer!
     "RTCTrackEvent",
 // IMPORTANT: Do not change this list without review from a DOM peer!
     "Screen",
 // IMPORTANT: Do not change this list without review from a DOM peer!