diff --git a/station_map.h b/station_map.h
index 97b848eed5..41d9f6ce41 100644
--- a/station_map.h
+++ b/station_map.h
@@ -29,7 +29,7 @@ enum {
 	BUOY_BASE = 0x52,
 	AIRPORT_BASE_EXTENDED = 0x53,
 
-	TYPE_MAX = 0x72
+	BASE_END = 0x73
 };
 
 enum {
@@ -38,7 +38,7 @@ enum {
 	TRUCK_SIZE = BUS_BASE - TRUCK_BASE,
 	BUS_SIZE = OILRIG_BASE - BUS_BASE,
 	DOCK_SIZE_TOTAL = BUOY_BASE - DOCK_BASE,
-	AIRPORT_SIZE_EXTENDED = TYPE_MAX - AIRPORT_BASE_EXTENDED
+	AIRPORT_SIZE_EXTENDED = BASE_END - AIRPORT_BASE_EXTENDED
 };
 
 typedef enum HangarTiles {