diff --git a/galicea_openid_connect/controllers/main.py b/galicea_openid_connect/controllers/main.py
index e2d779c..423cac6 100644
--- a/galicea_openid_connect/controllers/main.py
+++ b/galicea_openid_connect/controllers/main.py
@@ -188,7 +188,7 @@ class Main(http.Controller):
                 )
         except OAuthException as e:
             response_params['error'] = e.type
-            response_params['error_description'] = e.message
+            response_params['error_description'] = e
             return self.__redirect(redirect_uri, response_params, response_mode or 'query')
 
         if not response_mode:
@@ -281,7 +281,7 @@ class Main(http.Controller):
                     OAuthException.UNSUPPORTED_GRANT_TYPE,
                 )
         except OAuthException as e:
-            body = json.dumps({'error': e.type, 'error_description': e.message})
+            body = json.dumps({'error': e.type, 'error_description': e})
             return werkzeug.Response(response=body, status=400, headers=cors_headers)
 
     def __handle_grant_type_authorization_code(self, req, **query):