diff --git a/jupyter_server/prometheus/metrics.py b/jupyter_server/prometheus/metrics.py
index 04f0070c3..7e3481b80 100644
--- a/jupyter_server/prometheus/metrics.py
+++ b/jupyter_server/prometheus/metrics.py
@@ -4,6 +4,7 @@
 Read https://prometheus.io/docs/practices/naming/ for naming
 conventions for metrics & labels.
 """
+
 # Do this to see if we end up in an import loop?
 from notebook.prometheus.metrics import (
     HTTP_REQUEST_DURATION_SECONDS,