diff --git a/source/Ox/js/Type.js b/source/Ox/js/Type.js
index 8da157ff..a1586729 100644
--- a/source/Ox/js/Type.js
+++ b/source/Ox/js/Type.js
@@ -7,11 +7,16 @@ Ox.isArguments <f> Tests if a value is an arguments "array"
     > Ox.isArguments((function() { return arguments; }()))
     true
 @*/
-Ox.isArguments = /MSIE/.test(navigator.userAgent) ? function(val) {
-    return !!(val && Object.hasOwnProperty.call(val, 'callee'));
-} : function(val) {
+Ox.isArguments = function(val) {
     return !!(val && val.toString() == '[object Arguments]');
 }
+if (!(function() {
+    return Ox.isArguments(arguments);
+}())) {
+    Ox.isArguments = function(val) {
+        return !!(val && Object.hasOwnProperty.call(val, 'callee'));
+    };
+}
 
 /*@
 Ox.isArray <f> Tests if a value is an array