1 files changed, 1 insertions, 1 deletions

diff --git a/synapse/storage/_base.py b/synapse/storage/_base.py

index 9aa404695d..3ab81a78d5 100644
--- a/synapse/storage/_base.py
+++ b/synapse/storage/_base.py
@@ -509,7 +509,7 @@ class SQLBaseStore(object):
                 )
 
                 if del_evs:
-                    prune_event(ev)
+                    ev = prune_event(ev)
                     ev.redacted_because = del_evs[0]
 
         return events