diff --git a/django/contrib/auth/tests/auth_backends.py b/django/contrib/auth/tests/auth_backends.py
index 2ab0bd0efa..61acdd8c73 100644
--- a/django/contrib/auth/tests/auth_backends.py
+++ b/django/contrib/auth/tests/auth_backends.py
@@ -338,6 +338,7 @@ class PermissionDeniedBackend(object):
         raise PermissionDenied
 
 
+@skipIfCustomUser
 class PermissionDeniedBackendTest(TestCase):
     """
     Tests that other backends are not checked once a backend raises PermissionDenied