diff --git a/lib/oauth.js b/lib/oauth.js
index 94a8e18..50ccd95 100644
--- a/lib/oauth.js
+++ b/lib/oauth.js
@@ -189,7 +189,7 @@ exports.OAuth.prototype._createSignature= function(signatureBase, tokenSecret) {
    if( tokenSecret === undefined ) var tokenSecret= "";
    else tokenSecret= this._encodeData( tokenSecret ); 
    // consumerSecret is already encoded
-   var key= this._encodeData(this._consumerSecret) + "&" + this._encodeData(tokenSecret);
+   var key= this._consumerSecret + "&" + tokenSecret;
 
    var hash= ""
    if( this._signatureMethod == "PLAINTEXT" ) {