diff --git a/openfl/transport/grpc/aggregator_client.py b/openfl/transport/grpc/aggregator_client.py
index bee3b3c1cb..b4ece200d9 100644
--- a/openfl/transport/grpc/aggregator_client.py
+++ b/openfl/transport/grpc/aggregator_client.py
@@ -227,7 +227,9 @@ def __init__(
         self.root_certificate = root_certificate
         self.certificate = certificate
         self.private_key = private_key
-        self.sleeping_policy = ConstantBackoff(int(kwargs.get("client_reconnect_interval", 1)), getLogger(__name__), self.uri)
+        self.sleeping_policy = ConstantBackoff(
+            int(kwargs.get("client_reconnect_interval", 1)), getLogger(__name__), self.uri
+        )
         self.logger = getLogger(__name__)
 
         if not self.use_tls: