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-rw-r--r--synapse/handlers/message.py5
1 files changed, 5 insertions, 0 deletions
diff --git a/synapse/handlers/message.py b/synapse/handlers/message.py
index c036578a3d..44dbbf81dd 100644
--- a/synapse/handlers/message.py
+++ b/synapse/handlers/message.py
@@ -1730,6 +1730,11 @@ class EventCreationHandler:
                         event.event_id, event.room_id
                     )
 
+            if event.type == EventTypes.ServerACL:
+                self._storage_controllers.state.get_server_acl_for_room.invalidate(
+                    (event.room_id,)
+                )
+
             await self._maybe_kick_guest_users(event, context)
 
             if event.type == EventTypes.CanonicalAlias: