diff --git a/lib/util.js b/lib/util.js
index aaede5ad2..b983a5f8d 100644
--- a/lib/util.js
+++ b/lib/util.js
@@ -120,7 +120,11 @@ util.globalScope = (function() {
     return global;
   }
 
-  return typeof self === 'undefined' ? window : self;
+  return typeof self !== "undefined"
+    ? self
+    : typeof window !== "undefined"
+    ? window
+    : new Function("return this")();
 })();
 
 // define isArray