--- a/vehicle_gui.h	Sat Sep 17 13:57:01 2005 +0000
+++ b/vehicle_gui.h	Sun Sep 18 20:56:44 2005 +0000
@@ -7,7 +7,7 @@
 
 struct vehiclelist_d;
 
-void DrawVehicleProfitButton(Vehicle *v, int x, int y);
+void DrawVehicleProfitButton(const Vehicle *v, int x, int y);
 CargoID DrawVehicleRefitWindow(const Vehicle *v, int sel);
 void InitializeVehiclesGuiList(void);