diff --git a/kallithea/controllers/admin/defaults.py b/kallithea/controllers/admin/defaults.py
--- a/kallithea/controllers/admin/defaults.py
+++ b/kallithea/controllers/admin/defaults.py
@@ -97,7 +97,7 @@ class DefaultsController(BaseController)
             h.flash(_('Default settings updated successfully'),
                     category='success')
 
-        except formencode.Invalid, errors:
+        except formencode.Invalid as errors:
             defaults = errors.value
 
             return htmlfill.render(