diff --git a/lib/omniauth/strategies/verticalresponse.rb b/lib/omniauth/strategies/verticalresponse.rb
index f0d5fb0..6645c99 100644
--- a/lib/omniauth/strategies/verticalresponse.rb
+++ b/lib/omniauth/strategies/verticalresponse.rb
@@ -10,11 +10,14 @@ class Verticalresponse < OmniAuth::Strategies::OAuth2
           token_url:      'api/v1/oauth/access_token'
       }
       option :provider_ignores_state, true
-  
+
       uid do
         access_token.params['user_id']
       end
 
+      def callback_url
+        full_host + script_name + callback_path
+      end
     end
   end
 end