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-rw-r--r--synapse/federation/replication.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/synapse/federation/replication.py b/synapse/federation/replication.py
index 2ed303e12d..65a53ae17c 100644
--- a/synapse/federation/replication.py
+++ b/synapse/federation/replication.py
@@ -582,6 +582,9 @@ class ReplicationLayer(object):
         #TODO: Check we have all the PDU keys here
         pdu_json.setdefault("hashes", {})
         pdu_json.setdefault("signatures", {})
+        sender = pdu_json.pop("sender", None)
+        if sender is not None:
+            pdu_json["user_id"] = sender
         state_hash = pdu_json.get("unsigned", {}).pop("state_hash", None)
         if state_hash is not None:
             pdu_json["state_hash"] = state_hash