diff --git a/assets/layers/questions/questions.json b/assets/layers/questions/questions.json
index 2339a5d94..eee13b256 100644
--- a/assets/layers/questions/questions.json
+++ b/assets/layers/questions/questions.json
@@ -3612,7 +3612,7 @@
           }
         }
       ],
-      "onSoftDelete": "reservation="
+      "onSoftDelete": ["reservation="]
     },
     {
       "id": "ref",