diff --git a/data/json/mapgen/farm_dairy.json b/data/json/mapgen/farm_dairy.json
index a77c29b3698ca..7257eca2ec7d1 100644
--- a/data/json/mapgen/farm_dairy.json
+++ b/data/json/mapgen/farm_dairy.json
@@ -477,21 +477,21 @@
     "method": "json",
     "om_terrain": [
       [
-        "farm_dairy_twd_second_floor_1",
-        "farm_dairy_twd_second_floor_2",
+        "air",
+        "air",
         "farm_dairy_twd_second_floor_3",
         "farm_dairy_twd_second_floor_4"
       ],
       [
         "farm_dairy_twd_second_floor_5",
         "farm_dairy_twd_second_floor_6",
-        "farm_dairy_twd_second_floor_7",
-        "farm_dairy_twd_second_floor_8"
+        "air",
+        "air"
       ],
       [
-        "farm_dairy_twd_second_floor_9",
-        "farm_dairy_twd_second_floor_10",
-        "farm_dairy_twd_second_floor_11",
+        "air",
+        "air",
+        "air",
         "farm_dairy_twd_second_floor_12"
       ]
     ],