Index: /usr/local/src/django-trunk/django/contrib/contenttypes/generic.py
===================================================================
--- /usr/local/src/django-trunk/django/contrib/contenttypes/generic.py	(revision 9781)
+++ /usr/local/src/django-trunk/django/contrib/contenttypes/generic.py	(working copy)
@@ -307,7 +307,7 @@
         # Avoid a circular import.
         from django.contrib.contenttypes.models import ContentType
         if self.instance is None:
-            return self.model._default_manager.empty()
+            return self.model._default_manager.get_empty_query_set()
         return self.model._default_manager.filter(**{
             self.ct_field.name: ContentType.objects.get_for_model(self.instance),
             self.ct_fk_field.name: self.instance.pk,