1 files changed, 3 insertions, 3 deletions
diff --git a/synapse/handlers/message.py b/synapse/handlers/message.py
index 7e5bb97f2a..0ce6eeee15 100644
--- a/synapse/handlers/message.py
+++ b/synapse/handlers/message.py
@@ -1654,9 +1654,9 @@ class EventCreationHandler:
                     expiry_ms=60 * 60 * 1000,
                 )
 
-                self._external_cache_joined_hosts_updates[
-                    state_entry.state_group
-                ] = None
+                self._external_cache_joined_hosts_updates[state_entry.state_group] = (
+                    None
+                )
 
     async def _validate_canonical_alias(
         self,