diff --git a/lib/oauth.js b/lib/oauth.js
index 50dccf99..bf08561d 100644
--- a/lib/oauth.js
+++ b/lib/oauth.js
@@ -6,7 +6,7 @@ var crypto= require('crypto'),
     querystring= require('querystring'),
     OAuthUtils= require('./_utils');
 
-exports.OAuth= function(requestUrl, accessUrl, consumerKey, consumerSecret, version, authorize_callback, signatureMethod, nonceSize, customHeaders) {
+exports.OAuth= function(requestUrl, accessUrl, consumerKey, consumerSecret, version, authorize_callback, signatureMethod, nonceSize, customHeaders, realm) {
   this._isEcho = false;
 
   this._requestUrl= requestUrl;
@@ -31,6 +31,9 @@ exports.OAuth= function(requestUrl, accessUrl, consumerKey, consumerSecret, vers
   this._headers= customHeaders || {"Accept" : "*/*",
                                    "Connection" : "close",
                                    "User-Agent" : "Node authentication"}
+
+  this._realm = realm;
+
   this._clientOptions= this._defaultClientOptions= {"requestTokenHttpMethod": "POST",
                                                     "accessTokenHttpMethod": "POST",
                                                     "followRedirects": true};
@@ -119,7 +122,7 @@ exports.OAuth.prototype._isParameterNameAnOAuthParameter= function(parameter) {
 // build the OAuth request authorization header
 exports.OAuth.prototype._buildAuthorizationHeaders= function(orderedParameters) {
   var authHeader="OAuth ";
-  if( this._isEcho ) {
+  if( this._isEcho || this._realm ) {
     authHeader += 'realm="' + this._realm + '",';
   }