diff --git a/lib/mongrel2.js b/lib/mongrel2.js
index 9db93d2..2ddce7d 100644
--- a/lib/mongrel2.js
+++ b/lib/mongrel2.js
@@ -1,7 +1,7 @@
 var Sys, Zeromq, buildHttpResponse, parse, parseNetstring, split, statusMessages;
 var __hasProp = Object.prototype.hasOwnProperty;
 Zeromq = require('zeromq');
-Sys = require('sys');
+Sys = require('util');
 statusMessages = {
   '100': 'Continue',
   '101': 'Switching Protocols',