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-rw-r--r--synapse/storage/events.py5
1 files changed, 5 insertions, 0 deletions
diff --git a/synapse/storage/events.py b/synapse/storage/events.py
index c80d181fc7..72ce84b0b8 100644
--- a/synapse/storage/events.py
+++ b/synapse/storage/events.py
@@ -776,6 +776,11 @@ class EventsStore(SQLBaseStore):
                         txn, self.get_rooms_for_user, (member,)
                     )
 
+                for host in set(get_domain_from_id(u) for u in members_changed):
+                    self._invalidate_cache_and_stream(
+                        txn, self.is_host_joined, (room_id, host)
+                    )
+
                 self._invalidate_cache_and_stream(
                     txn, self.get_users_in_room, (room_id,)
                 )