diff --git a/server/planning/events/events.py b/server/planning/events/events.py
index 10ff29c13..78d07cac4 100644
--- a/server/planning/events/events.py
+++ b/server/planning/events/events.py
@@ -340,7 +340,7 @@ def on_created(self, docs):
 
                 duplicate_ids = parent_event.get("duplicate_to", [])
                 duplicate_ids.append(event_id)
-                self.patch(parent_id, {"duplicate_to": duplicate_ids})
+                self.patch(parent_id, {"duplicate_to": duplicate_ids, config.ID_FIELD: parent_id})
 
             event_type = "events:created"
             user_id = str(doc.get("original_creator", ""))