diff --git a/synapse/handlers/message.py b/synapse/handlers/message.py
index 8100efcab3..a324f09340 100644
--- a/synapse/handlers/message.py
+++ b/synapse/handlers/message.py
@@ -992,7 +992,9 @@ class EventCreationHandler(object):
                     # way? If we have been invited by a remote server, we need
                     # to get them to sign the event.
 
-                    returned_invite = await federation_handler.send_invite(invitee.domain, event)
+                    returned_invite = await federation_handler.send_invite(
+                        invitee.domain, event
+                    )
                     event.unsigned.pop("room_state", None)
 
                     # TODO: Make sure the signatures actually are correct.