diff --git a/data/json/overmap/overmap_terrain/overmap_terrain_faction_base.json b/data/json/overmap/overmap_terrain/overmap_terrain_faction_base.json
index 6deac0555700b..3ecb445159c6a 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain_faction_base.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain_faction_base.json
@@ -7,7 +7,8 @@
     "sym": "+",
     "color": "white",
     "see_cost": "none",
-    "flags": [ "NO_ROTATE", "SOURCE_PEOPLE", "SHOULD_NOT_SPAWN" ]
+    "flags": [ "NO_ROTATE", "SOURCE_PEOPLE", "SHOULD_NOT_SPAWN" ],
+    "travel_cost_type": "field"
   },
   {
     "type": "overmap_terrain",