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-rw-r--r--synapse/handlers/federation_event.py6
1 files changed, 6 insertions, 0 deletions
diff --git a/synapse/handlers/federation_event.py b/synapse/handlers/federation_event.py
index 7c62cdfaef..0cc8e990d9 100644
--- a/synapse/handlers/federation_event.py
+++ b/synapse/handlers/federation_event.py
@@ -2342,6 +2342,12 @@ class FederationEventHandler:
             # TODO retrieve the previous state, and exclude join -> join transitions
             self._notifier.notify_user_joined_room(event.event_id, event.room_id)
 
+        # If this is a server ACL event, clear the cache in the storage controller.
+        if event.type == EventTypes.ServerACL:
+            self._state_storage_controller.get_server_acl_for_room.invalidate(
+                (event.room_id,)
+            )
+
     def _sanity_check_event(self, ev: EventBase) -> None:
         """
         Do some early sanity checks of a received event