diff --git a/src/pixi/textures/RenderTexture.js b/src/pixi/textures/RenderTexture.js
index 5e22c6b..130f4fd 100644
--- a/src/pixi/textures/RenderTexture.js
+++ b/src/pixi/textures/RenderTexture.js
@@ -302,7 +302,7 @@
         var canvasData = tempCanvas.context.getImageData(0, 0, width, height);
         var canvasPixels = canvasData.data;
 
-        for (var i = 0; i < webGLPixels.length; i+=4)
+        for (var i = 0, len = webGLPixels.length; i < len; i+=4)
         {
             canvasPixels[i] = webGLPixels[i];
             canvasPixels[i+1] = webGLPixels[i+1];