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-rw-r--r--synapse/event_auth.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/event_auth.py b/synapse/event_auth.py
index af3eee95b9..d4d4474847 100644
--- a/synapse/event_auth.py
+++ b/synapse/event_auth.py
@@ -690,7 +690,7 @@ def auth_types_for_event(event):
     auth_types = []
 
     auth_types.append((EventTypes.PowerLevels, "", ))
-    auth_types.append((EventTypes.Member, event.user_id, ))
+    auth_types.append((EventTypes.Member, event.sender, ))
     auth_types.append((EventTypes.Create, "", ))
 
     if event.type == EventTypes.Member: