--- a/order.h	Thu May 12 00:20:16 2005 +0000
+++ b/order.h	Thu May 12 23:46:01 2005 +0000
@@ -141,7 +141,7 @@
 }
 
 /* Functions */
-void BackupVehicleOrders(Vehicle *v, BackuppedOrders *order);
+void BackupVehicleOrders(const Vehicle *v, BackuppedOrders *order);
 void RestoreVehicleOrders(Vehicle *v, BackuppedOrders *order);
 void DeleteDestinationFromVehicleOrder(Order dest);
 void InvalidateVehicleOrder(const Vehicle *v);