diff --git a/passerelle/urls_utils.py b/passerelle/urls_utils.py
index cd682845..19070ba7 100644
--- a/passerelle/urls_utils.py
+++ b/passerelle/urls_utils.py
@@ -119,7 +119,7 @@ def manager_required(function=None, login_url=None):
     def check_manager(user):
         if user and user.is_staff:
             return True
-        if user and not user.is_anonymous():
+        if user and not user.is_anonymous:
             raise PermissionDenied()
         # As the last resort, show the login form
         return False