diff --git a/src/vehicle_gui.h b/src/vehicle_gui.h
--- a/src/vehicle_gui.h
+++ b/src/vehicle_gui.h
@@ -49,7 +49,7 @@ enum TrainDetailsWindowTabs {
 int DrawVehiclePurchaseInfo(int left, int right, int y, EngineID engine_number);
 
 void DrawTrainImage(const Train *v, int left, int right, int y, VehicleID selection, int skip, VehicleID drag_dest = INVALID_VEHICLE);
-void DrawRoadVehImage(const Vehicle *v, int left, int right, int y, VehicleID selection);
+void DrawRoadVehImage(const Vehicle *v, int left, int right, int y, VehicleID selection, int skip = 0);
 void DrawShipImage(const Vehicle *v, int left, int right, int y, VehicleID selection);
 void DrawAircraftImage(const Vehicle *v, int left, int right, int y, VehicleID selection);