diff --git a/src/pixi/utils/Utils.js b/src/pixi/utils/Utils.js
index 0b2accd..9abbfff 100644
--- a/src/pixi/utils/Utils.js
+++ b/src/pixi/utils/Utils.js
@@ -21,32 +21,34 @@
  *
  * @method cancelAnimationFrame
  */
-var lastTime = 0;
-var vendors = ['ms', 'moz', 'webkit', 'o'];
-for(var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
-    window.requestAnimationFrame = window[vendors[x] + 'RequestAnimationFrame'];
-    window.cancelAnimationFrame = window[vendors[x] + 'CancelAnimationFrame'] ||
-        window[vendors[x] + 'CancelRequestAnimationFrame'];
-}
+(function(window) {
+    var lastTime = 0;
+    var vendors = ['ms', 'moz', 'webkit', 'o'];
+    for(var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
+        window.requestAnimationFrame = window[vendors[x] + 'RequestAnimationFrame'];
+        window.cancelAnimationFrame = window[vendors[x] + 'CancelAnimationFrame'] ||
+            window[vendors[x] + 'CancelRequestAnimationFrame'];
+    }
 
-if (!window.requestAnimationFrame) {
-    window.requestAnimationFrame = function(callback) {
-        var currTime = new Date().getTime();
-        var timeToCall = Math.max(0, 16 - (currTime - lastTime));
-        var id = window.setTimeout(function() { callback(currTime + timeToCall); },
-          timeToCall);
-        lastTime = currTime + timeToCall;
-        return id;
-    };
-}
+    if (!window.requestAnimationFrame) {
+        window.requestAnimationFrame = function(callback) {
+            var currTime = new Date().getTime();
+            var timeToCall = Math.max(0, 16 - (currTime - lastTime));
+            var id = window.setTimeout(function() { callback(currTime + timeToCall); },
+              timeToCall);
+            lastTime = currTime + timeToCall;
+            return id;
+        };
+    }
 
-if (!window.cancelAnimationFrame) {
-    window.cancelAnimationFrame = function(id) {
-        clearTimeout(id);
-    };
-}
+    if (!window.cancelAnimationFrame) {
+        window.cancelAnimationFrame = function(id) {
+            clearTimeout(id);
+        };
+    }
 
-window.requestAnimFrame = window.requestAnimationFrame;
+    window.requestAnimFrame = window.requestAnimationFrame;
+})(this);
 
 /**
  * Converts a hex color number to an [R, G, B] array
@@ -164,6 +166,7 @@
  */
 PIXI.canUseNewCanvasBlendModes = function()
 {
+    if (typeof document === 'undefined') return false;
     var canvas = document.createElement('canvas');
     canvas.width = 1;
     canvas.height = 1;