diff --git a/lib/index.js b/lib/index.js
index 3e37071..fd3aca5 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -5,7 +5,6 @@ var util = require('util');
 
 var native_findOne = mongodb.Collection.prototype.findOne;
 mongodb.Collection.prototype.findOne = function findOne(){
-    var original_arguments = arguments;
     var args = Array.prototype.slice.call(arguments, 0);
     var callback = args.pop();
     var self = this;