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-rw-r--r--synapse/events/utils.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/synapse/events/utils.py b/synapse/events/utils.py
index 738a151cef..fb22337e27 100644
--- a/synapse/events/utils.py
+++ b/synapse/events/utils.py
@@ -104,6 +104,8 @@ def prune_event_dict(room_version: RoomVersion, event_dict: dict) -> dict:
 
     if event_type == EventTypes.Member:
         add_fields("membership")
+        if room_version.msc3375_redaction_rules:
+            add_fields("join_authorised_via_users_server")
     elif event_type == EventTypes.Create:
         # MSC2176 rules state that create events cannot be redacted.
         if room_version.msc2176_redaction_rules: