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-rw-r--r--synapse/events/utils.py5
1 files changed, 4 insertions, 1 deletions
diff --git a/synapse/events/utils.py b/synapse/events/utils.py
index 10a6b9f264..08d6d6fa47 100644
--- a/synapse/events/utils.py
+++ b/synapse/events/utils.py
@@ -88,7 +88,10 @@ def prune_event(event):
     if "age_ts" in event.unsigned:
         allowed_fields["unsigned"]["age_ts"] = event.unsigned["age_ts"]
 
-    return type(event)(allowed_fields)
+    return type(event)(
+        allowed_fields,
+        internal_metadata_dict=event.internal_metadata.get_dict()
+    )
 
 
 def serialize_event(hs, e, client_event=True):