diff --git a/lib/oauth.js b/lib/oauth.js
index 50dccf99..e9c8fbe5 100644
--- a/lib/oauth.js
+++ b/lib/oauth.js
@@ -265,7 +265,7 @@ exports.OAuth.prototype._prepareParameters= function( oauth_token, oauth_token_s
       "oauth_consumer_key":     this._consumerKey
   };
 
-  if( oauth_token ) {
+  if( oauth_token || oauth_token === '' ) {
     oauthParameters["oauth_token"]= oauth_token;
   }