diff --git a/source/Ox/js/Function.js b/source/Ox/js/Function.js
index 782b4e17..f1b2c4c3 100644
--- a/source/Ox/js/Function.js
+++ b/source/Ox/js/Function.js
@@ -12,12 +12,12 @@ Ox.cache <f> Memoize a function
 @*/
 // TODO: add async test
 Ox.cache = function(fn, options) {
-    options = Ox.extend({
-        async: false,
-        key: JSON.stringify
-    }, options || {})
     var cache = {},
         ret = function() {
+            options = Ox.extend({
+                async: false,
+                key: JSON.stringify
+            }, options || {});
             var args = Ox.toArray(arguments), key = options.key(args);
             function callback() {
                 // cache all arguments passed to callback