diff --git a/embedding/qa/testembed/nsIEditSession.cpp b/embedding/qa/testembed/nsIEditSession.cpp
index 0d0d734d6384..a43832de6f05 100644
--- a/embedding/qa/testembed/nsIEditSession.cpp
+++ b/embedding/qa/testembed/nsIEditSession.cpp
@@ -98,7 +98,7 @@ void CnsIEditSession::MakeWinEditTest(PRBool afterUriLoad)
 	editingSession = GetEditSessionObject();
 	domWindow = GetTheDOMWindow(qaWebBrowser);
 	if (domWindow && editingSession) {
-		rv= editingSession->MakeWindowEditable(domWindow, afterUriLoad);
+		rv= editingSession->MakeWindowEditable(domWindow, NULL, afterUriLoad);
 		RvTestResult(rv, "MakeWindowEditable() test", 2);
 	}
 	else