diff --git a/data/mods/Aftershock/maps/afs_item_groups.json b/data/mods/Aftershock/maps/afs_item_groups.json
index 3caff3d06f308..3dd13e330d327 100644
--- a/data/mods/Aftershock/maps/afs_item_groups.json
+++ b/data/mods/Aftershock/maps/afs_item_groups.json
@@ -186,6 +186,7 @@
   {
     "id": "mischw",
     "type": "item_group",
+    "subtype": "collection",
     "items": [ [ "afs_power_cutter", 5 ] ]
   },
   {