diff --git a/jupyterhub/tests/test_services.py b/jupyterhub/tests/test_services.py
index fd46dd0f..379f92aa 100644
--- a/jupyterhub/tests/test_services.py
+++ b/jupyterhub/tests/test_services.py
@@ -88,6 +88,7 @@ async def test_external_service(app):
             }
         ]
         await maybe_future(app.init_services())
+        await maybe_future(app.init_roles())
         await app.init_api_tokens()
         await app.proxy.add_all_services(app._service_map)