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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 aab18d7f71..0e9fd902af 100644
--- a/synapse/events/utils.py
+++ b/synapse/events/utils.py
@@ -88,6 +88,8 @@ def prune_event(event):
 
     if "age_ts" in event.unsigned:
         allowed_fields["unsigned"]["age_ts"] = event.unsigned["age_ts"]
+    if "replaces_state" in event.unsigned:
+        allowed_fields["unsigned"]["replaces_state"] = event.unsigned["replaces_state"]
 
     return type(event)(
         allowed_fields,