diff --git a/interfaces/webrtc-stats.idl b/interfaces/webrtc-stats.idl
index b2bf38e9fd45f8..cf07738b8b45c8 100644
--- a/interfaces/webrtc-stats.idl
+++ b/interfaces/webrtc-stats.idl
@@ -239,7 +239,7 @@ dictionary RTCTransportStats : RTCStats {
 dictionary RTCIceCandidateStats : RTCStats {
              DOMString transportId;
              RTCNetworkType networkType;
-             DOMString address;
+             DOMString? address;
              long port;
              DOMString protocol;
              RTCIceCandidateType candidateType;