diff --git a/tests/test_manager.py b/tests/test_manager.py
index bdf6c0fa1..317c434d8 100644
--- a/tests/test_manager.py
+++ b/tests/test_manager.py
@@ -157,6 +157,7 @@ def test_manager_user_edit_by_uuid(app, superuser, simple_user):
     assert simple_user.first_name.encode('utf-8') in resp.content
 
 
+@pytest.mark.slow
 def test_manager_stress_create_user(superuser_or_admin, app, mailoutbox):
     new_ou = OU.objects.create(name='new ou', slug='new-ou')
     url = reverse('a2-manager-user-add', kwargs={'ou_pk': new_ou.pk})