diff --git a/lib/test/testing_util.js b/lib/test/testing_util.js
index 6a32756..dfe0a2d 100644
--- a/lib/test/testing_util.js
+++ b/lib/test/testing_util.js
@@ -2,7 +2,7 @@
   var EventBuffer, check_exec, check_exec_options, exec, listsContainSameElements, sys;
   var __slice = Array.prototype.slice;
   exec = require('child_process').exec;
-  sys = require('sys');
+  util = require('util');
   exports.check_exec_options = check_exec_options = function(cmd, options, callback) {
     return exec(cmd, options, function(e, stdout, stderr) {
       if (e) {
@@ -57,7 +57,7 @@
     EventBuffer.prototype.expect = function() {
       var args, t;
       t = arguments[0], args = 2 <= arguments.length ? __slice.call(arguments, 1) : [];
-      sys.debug("Expecting " + args[0] + "...");
+      util.debug("Expecting " + args[0] + "...");
       return this.wait(function(event) {
         var i, x, _len, _ref;
         _ref = args.slice(0, -1);