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-rw-r--r--synapse/federation/federation_client.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/federation/federation_client.py b/synapse/federation/federation_client.py
index c6ed720166..7e1690b0fb 100644
--- a/synapse/federation/federation_client.py
+++ b/synapse/federation/federation_client.py
@@ -343,7 +343,7 @@ class FederationClient(FederationBase):
 
             defer.returnValue((pdus, auth_chain))
         except HttpResponseException as e:
-            if e.code == 404:
+            if e.code == 400 or e.code == 404:
                 logger.info("Failed to use get_room_state_ids API, falling back")
             else:
                 raise e