diff --git a/websocket-sharp/Net/AuthenticationResponse.cs b/websocket-sharp/Net/AuthenticationResponse.cs
index 23647b04..c4b5cb98 100644
--- a/websocket-sharp/Net/AuthenticationResponse.cs
+++ b/websocket-sharp/Net/AuthenticationResponse.cs
@@ -375,10 +375,10 @@ namespace WebSocketSharp.Net
     internal string ToBasicString ()
     {
       var user = _parameters["username"];
-      var pass = _parameters["password"];
-      var userPass = String.Format ("{0}:{1}", user, pass);
+      var passwd = _parameters["password"];
+      var userPasswd = String.Format ("{0}:{1}", user, passwd);
 
-      var bytes = Encoding.UTF8.GetBytes (userPass);
+      var bytes = Encoding.UTF8.GetBytes (userPasswd);
       var cred = Convert.ToBase64String (bytes);
 
       return "Basic " + cred;