diff --git a/webrtc/p2p/base/icetransportinternal.h b/webrtc/p2p/base/icetransportinternal.h
index 05939629f8..bd3c78a770 100644
--- a/webrtc/p2p/base/icetransportinternal.h
+++ b/webrtc/p2p/base/icetransportinternal.h
@@ -25,6 +25,9 @@ class MetricsObserverInterface;
 
 namespace cricket {
 
+class IceTransportInternal;
+typedef IceTransportInternal IceTransportInternal2;
+
 // TODO(zhihuang): replace it with PeerConnectionInterface::IceConnectionState.
 enum class IceTransportState {
   STATE_INIT,