diff --git a/data/json/mapgen/robofaq_locs/robofac_mission_chunks.json b/data/json/mapgen/robofaq_locs/robofac_mission_chunks.json
index 8b352d9221390..c237e67a7abd5 100644
--- a/data/json/mapgen/robofaq_locs/robofac_mission_chunks.json
+++ b/data/json/mapgen/robofaq_locs/robofac_mission_chunks.json
@@ -33,6 +33,7 @@
       ],
       "terrain": { "@": "t_pavement", "A": "t_pavement", "M": "t_pavement", "#": "t_pavement" },
       "furniture": { "#": "f_wreckage" },
+      "flags": [ "ERASE_ALL_BEFORE_PLACING_TERRAIN" ],
       "place_vehicles": [
         { "vehicle": "humvee", "x": 18, "y": 15, "fuel": 0, "status": 1, "chance": 100 },
         { "vehicle": "humvee", "x": 16, "y": 4, "fuel": 0, "status": 1, "chance": 100 },
@@ -89,6 +90,7 @@
         "                        "
       ],
       "terrain": { "@": "t_pavement" },
+      "flags": [ "ALLOW_TERRAIN_UNDER_OTHER_DATA" ],
       "monster": {
         "T": { "monster": "mon_leech_blossom" },
         "k": { "monster": "mon_leech_pod_cluster" },