diff --git a/lib/RequestSignatureHelper.js b/lib/RequestSignatureHelper.js
index 966b535..140d9e7 100644
--- a/lib/RequestSignatureHelper.js
+++ b/lib/RequestSignatureHelper.js
@@ -1,5 +1,4 @@
-var crypto = require('crypto'),
-    sys = require('sys');
+var crypto = require('crypto');
 
 var RSH = function(params) {
     this.init(params);
diff --git a/test/RequestSignatureHelper.js b/test/RequestSignatureHelper.js
index 50a3023..5dbc4d7 100644
--- a/test/RequestSignatureHelper.js
+++ b/test/RequestSignatureHelper.js
@@ -1,5 +1,4 @@
-var sys = require('sys'),
-    assert = require('assert'),
+var assert = require('assert'),
     RSH = require('../lib/RequestSignatureHelper').RequestSignatureHelper;
 
 // constructor