diff --git a/magnum_cluster_api/objects.py b/magnum_cluster_api/objects.py
index 2d421c10..1f3f6210 100644
--- a/magnum_cluster_api/objects.py
+++ b/magnum_cluster_api/objects.py
@@ -247,7 +247,9 @@ def for_magnum_cluster(
     def for_magnum_cluster_or_none(
         cls, api: pykube.HTTPClient, cluster: magnum_objects.Cluster
     ) -> "Cluster":
-        return cls.objects(api, namespace="magnum-system").get_or_none(name=cluster.stack_id)
+        return cls.objects(api, namespace="magnum-system").get_or_none(
+            name=cluster.stack_id
+        )
 
     def get_machine_deployment_index(self, name: str) -> int:
         for i, machine_deployment in enumerate(