diff --git a/lib/RequestAnimationFrame.js b/lib/RequestAnimationFrame.js
index 62f7843..4682cae 100644
--- a/lib/RequestAnimationFrame.js
+++ b/lib/RequestAnimationFrame.js
@@ -1,14 +1,24 @@
 define(['Chuck/Settings'], function(Settings) {
 
 	var requestAnimFrame =  (function(){
-      return window.requestAnimationFrame       || 
-             window.webkitRequestAnimationFrame || 
-             window.mozRequestAnimationFrame    || 
-             window.oRequestAnimationFrame      || 
-             window.msRequestAnimationFrame     || 
-             function( callback ){
-                setTimeout(callback, Settings.BOX2D_TIME_STEP * 1000);
-             };
+
+        var _setTimeout = function( callback ){
+            setTimeout(callback, Settings.BOX2D_TIME_STEP * 1000);
+        }
+
+        if (typeof window != 'undefined') {
+
+            return  window.requestAnimationFrame       || 
+                    window.webkitRequestAnimationFrame || 
+                    window.mozRequestAnimationFrame    || 
+                    window.oRequestAnimationFrame      || 
+                    window.msRequestAnimationFrame     || 
+                    _setTimeout;
+
+        } else {
+            return _setTimeout;
+        }
+
     })();
 
 	return requestAnimFrame;