diff --git a/source/Ox.UI/js/Core/Element.js b/source/Ox.UI/js/Core/Element.js
index 038b3c0c..d158fd6d 100644
--- a/source/Ox.UI/js/Core/Element.js
+++ b/source/Ox.UI/js/Core/Element.js
@@ -525,7 +525,7 @@ Ox.Element = function(options, self) {
     @*/
     that.update = function() {
         var callbacks;
-        if (Ox.typeOf(arguments[0]) == 'function') {
+        if (Ox.isFunction(arguments[0])) {
             self.updateCallbacks.push(arguments[0]);
         } else {
             callbacks = Ox.makeObject(arguments);