diff --git a/jupyter_scheduler/workflows.py b/jupyter_scheduler/workflows.py
index 6a217c18..ae5644d5 100644
--- a/jupyter_scheduler/workflows.py
+++ b/jupyter_scheduler/workflows.py
@@ -3,6 +3,7 @@
 
 from jupyter_server.utils import ensure_async
 from tornado.web import HTTPError, authenticated
+
 from jupyter_scheduler.exceptions import (
     IdempotencyTokenError,
     InputUriError,