diff --git a/droll.js b/droll.js
index <HASH>..<HASH> 100644
--- a/droll.js
+++ b/droll.js
@@ -1,8 +1,7 @@
-(function() {
+(function(root) {
 
    "use strict";
 
-  var root  = this;
   var droll = {};
 
   // Define a "class" to represent a formula
@@ -106,4 +105,4 @@
     root.droll = droll;
   }
 
-}());
\ No newline at end of file
+}(this));
\ No newline at end of file
Fix a 'this' related issue regarding strict mode