--- a/src/openttd.h
+++ b/src/openttd.h
@@ -32,14 +32,6 @@
 typedef uint16 SignID;
 typedef uint16 GroupID;
 typedef uint16 EngineRenewID;
-typedef uint16 DestinationID;
-
-/* DestinationID must be at least as large as every these below, because it can
- * be any of them
- */
-assert_compile(sizeof(DestinationID) >= sizeof(DepotID));
-assert_compile(sizeof(DestinationID) >= sizeof(WaypointID));
-assert_compile(sizeof(DestinationID) >= sizeof(StationID));
 
 enum GameModes {
 	GM_MENU,

--- a/src/order.h
+++ b/src/order.h
@@ -12,6 +12,8 @@
 #include "tile_type.h"
 #include "date_type.h"
 
+typedef uint16 DestinationID;
+
 enum {
 	INVALID_VEH_ORDER_ID = 0xFF,
 };

--- a/src/order_cmd.cpp
+++ b/src/order_cmd.cpp
@@ -25,6 +25,13 @@
 
 #include "table/strings.h"
 
+/* DestinationID must be at least as large as every these below, because it can
+ * be any of them
+ */
+assert_compile(sizeof(DestinationID) >= sizeof(DepotID));
+assert_compile(sizeof(DestinationID) >= sizeof(WaypointID));
+assert_compile(sizeof(DestinationID) >= sizeof(StationID));
+
 TileIndex _backup_orders_tile;
 BackuppedOrders _backup_orders_data;