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-rw-r--r--tests/replication/test_federation_sender_shard.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/tests/replication/test_federation_sender_shard.py b/tests/replication/test_federation_sender_shard.py
index 9b28cd474f..59f4fdc70b 100644
--- a/tests/replication/test_federation_sender_shard.py
+++ b/tests/replication/test_federation_sender_shard.py
@@ -261,7 +261,7 @@ class FederationSenderTestCase(BaseMultiWorkerStreamTestCase):
 
         builder = factory.for_room_version(room_version, event_dict)
         join_event = self.get_success(
-            builder.build(prev_event_ids=prev_event_ids, auth_event_ids=None)
+            builder.build(prev_event_ids=list(prev_event_ids), auth_event_ids=None)
         )
 
         self.get_success(federation.on_send_membership_event(remote_server, join_event))