diff --git a/dom/src/jsurl/nsJSProtocolHandler.cpp b/dom/src/jsurl/nsJSProtocolHandler.cpp
index 88a5f3441ad2..09a954b112c4 100644
--- a/dom/src/jsurl/nsJSProtocolHandler.cpp
+++ b/dom/src/jsurl/nsJSProtocolHandler.cpp
@@ -198,6 +198,7 @@ nsJSProtocolHandler::NewChannel(const char* verb,
                                 nsIChannel* *result)
 {
     NS_ENSURE_ARG_POINTER(uri);
+    NS_ENSURE_ARG_POINTER(notificationCallbacks);
 
     nsresult rv;