diff --git a/src/core/renderers/webgl/filters/SpriteMaskFilter.js b/src/core/renderers/webgl/filters/SpriteMaskFilter.js
index 9337962..0b1b91c 100644
--- a/src/core/renderers/webgl/filters/SpriteMaskFilter.js
+++ b/src/core/renderers/webgl/filters/SpriteMaskFilter.js
@@ -1,5 +1,6 @@
 var AbstractFilter = require('./AbstractFilter'),
-    math =  require('../../../math');
+    math =  require('../../../math'),
+    fs = require('fs');
 
 /**
  * The SpriteMaskFilter class