diff --git a/nvflare/fuel/hci/server/hci.py b/nvflare/fuel/hci/server/hci.py
index 3fea83e472..fcc27834a4 100644
--- a/nvflare/fuel/hci/server/hci.py
+++ b/nvflare/fuel/hci/server/hci.py
@@ -20,6 +20,7 @@
 from nvflare.fuel.hci.conn import Connection, receive_til_end
 from nvflare.fuel.hci.proto import validate_proto
 from nvflare.fuel.hci.security import get_certificate_common_name
+
 from .reg import ServerCommandRegister
 
 MAX_ADMIN_CONNECTIONS = 128