diff --git a/lib/lastfm_strategy.js b/lib/lastfm_strategy.js
index f949b95..79781e8 100644
--- a/lib/lastfm_strategy.js
+++ b/lib/lastfm_strategy.js
@@ -15,7 +15,6 @@ function LastfmStrategy(options, verify){
   options = options || {};
   if (!options.api_key && !options.clientID)  { throw new TypeError('LastfmStrategy requires a clientID obtained from http://www.last.fm/api/account/create'); }
   if (!options.secret && !options.clientSecret)  { throw new TypeError('LastfmStrategy requires a clientSecret obtained from http://www.last.fm/api/account/create'); }
-  if (!options.callback_url && !options.callbackURL)  { throw new TypeError('LastfmStrategy requires a callbackURL option'); }
 
   if (!verify || typeof(verify) != 'function')  { throw new TypeError('LastfmStrategy requires verify callback function'); }
 
@@ -37,7 +36,11 @@ function LastfmStrategy(options, verify){
 
 LastfmStrategy.prototype.authenticate = function(request, options){
   var self = this;
-  var authUrl = self.getAuthenticationUrl({cb:self.callbackURL});
+  var callbackURL = options.callback_url || options.callbackURL || self.callbackURL;
+
+  if (!callbackURL) throw new TypeError('LastfmStrategy requires a callbackURL option');
+
+  var authUrl = self.getAuthenticationUrl({cb:callbackURL});
 
 
   if (request.query && request.query.token){
@@ -80,7 +83,7 @@ LastfmStrategy.prototype.getAuthenticationUrl = function(param) {
 
   if (params.token) { urlParts.query.token = params.token; }
 
-  var rtn = `${url.format(urlParts)}&cb=${this.callbackURL}`;
+  var rtn = `${url.format(urlParts)}&cb=${param.cb}`;
   return rtn ;
 };