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-rw-r--r--synapse/handlers/federation.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/synapse/handlers/federation.py b/synapse/handlers/federation.py
index 65cfacba2e..15ba417e06 100644
--- a/synapse/handlers/federation.py
+++ b/synapse/handlers/federation.py
@@ -290,6 +290,8 @@ class FederationHandler(BaseHandler):
         """
         logger.debug("Joining %s to %s", joinee, room_id)
 
+        yield self.store.clean_room_for_join(room_id)
+
         origin, pdu = yield self.replication_layer.make_join(
             target_hosts,
             room_id,