diff --git a/src/event.js b/src/event.js
index 08deb8b2..e46e1086 100644
--- a/src/event.js
+++ b/src/event.js
@@ -638,7 +638,7 @@ function bindReady(){
 
 		// If IE and not an iframe
 		// continually check to see if the document is ready
-		if ( document.documentElement.doScroll && !window.frameElement ) (function(){
+		if ( document.documentElement.doScroll && typeof window.frameElement === "undefined" ) (function(){
 			if ( jQuery.isReady ) return;
 
 			try {