diff --git a/event/models.py b/event/models.py
index 14d7980..36dca46 100644
--- a/event/models.py
+++ b/event/models.py
@@ -178,7 +178,7 @@ class Activity(AbstractActivityTemplate):
         inherited_fields = [f.name for f in ActivityTemplate._meta.get_fields()]
         m2m_fields = [f.name for f in ActivityTemplate._meta.get_fields()
                       if f.many_to_many]
-        attr = super(Activity, self).__getattribute__(attrname)
+        attr = getattr(self, attrname)
         if attrname not in inherited_fields:
             raise FieldError(
                     _("%(attrname)s n'est pas un champ héritable"),
@@ -188,9 +188,9 @@ class Activity(AbstractActivityTemplate):
             if attr.exists():
                 return attr
             else:
-                return self.parent.__getattribute__(attrname)
+                return getattr(self.parent, attrname)
         elif attr is None:
-            return self.parent.__getattribute__(attrname)
+            return getattr(self.parent, attrname)
         else:
             return attr