diff --git a/dom/webidl/RTCPeerConnection.webidl b/dom/webidl/RTCPeerConnection.webidl
index 510957056f..6fb4194c36 100644
--- a/dom/webidl/RTCPeerConnection.webidl
+++ b/dom/webidl/RTCPeerConnection.webidl
@@ -9,7 +9,6 @@
 
 callback RTCSessionDescriptionCallback = void (RTCSessionDescription sdp);
 callback RTCPeerConnectionErrorCallback = void (DOMError error);
-callback VoidFunction = void ();
 callback RTCStatsCallback = void (RTCStatsReport report);
 
 enum RTCSignalingState {