diff --git a/app/controllers/last_fm_controller.rb b/app/controllers/last_fm_controller.rb
index f6c4091..a9accb0 100644
--- a/app/controllers/last_fm_controller.rb
+++ b/app/controllers/last_fm_controller.rb
@@ -37,7 +37,8 @@ class LastFmController < ApplicationController
     else
       render :json => {
         :connected => false,
-        :lastfm_login_url => 'http://www.last.fm/api/auth?api_key='+ @@api_key +'&cb=http://localhost/lastfm/connect/?sid='+ user.session.key
+        :lastfm_login_url => 'http://www.last.fm/api/auth?api_key='+ @@api_key +
+          '&cb=http://'+ request.host << '/lastfm/connect/?sid='+ user.session.key
       }
     end
   end