diff --git a/data/json/overmap/overmap_terrain/overmap_terrain_waste_junk.json b/data/json/overmap/overmap_terrain/overmap_terrain_waste_junk.json
index 626cd43aa288..afc88d01b391 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain_waste_junk.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain_waste_junk.json
@@ -69,7 +69,7 @@
   },
   {
     "type": "overmap_terrain",
-    "id": [ "toxic_dump_roof" ],
+    "id": "toxic_dump_roof",
     "name": "toxic waste dump roof",
     "sym": "D",
     "color": "pink"