diff --git a/source/Ox/js/Fallback.js b/source/Ox/js/Fallback.js
index bc929b7f..d1b4db67 100644
--- a/source/Ox/js/Fallback.js
+++ b/source/Ox/js/Fallback.js
@@ -123,6 +123,19 @@ Ox.fallback.indexOf = function(value) {
     return ret;
 };
 
+/*@
+Ox.fallback.isArray <f> see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/isArray
+    > Ox.fallback.isArray([])
+    true
+    > Ox.fallback.isArray((function() { return arguments; }()))
+    false
+    > Ox.fallback.isArray({0: 0, length: 1})
+    false
+@*/
+Ox.fallback.isArray = function(value) {
+    return Object.prototype.toString.call(value) == '[object Array]';
+};
+
 /*@
 Ox.fallback.lastIndexOf <f> see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/lastIndexOf
     > Ox.fallback.lastIndexOf.call([1, 2, 3, 2, 1], 2)
@@ -265,6 +278,7 @@ Ox.fallback.trim = function() {
     var method, object;
     for (method in Ox.fallback) {
         object = method == 'bind' ? Function.prototype
+            : method == 'isArray' ? Array
             : method == 'keys' ? Object
             : method == 'trim' ? String.prototype
             : Array.prototype;