diff --git a/src/vehicle_func.h b/src/vehicle_func.h
--- a/src/vehicle_func.h
+++ b/src/vehicle_func.h
@@ -65,7 +65,7 @@ void TrainConsistChanged(Vehicle *v, boo
 void TrainPowerChanged(Vehicle *v);
 Money GetTrainRunningCost(const Vehicle *v);
 
-CommandCost SendAllVehiclesToDepot(VehicleType type, uint32 flags, bool service, Owner owner, uint16 vlw_flag, uint32 id);
+CommandCost SendAllVehiclesToDepot(VehicleType type, DoCommandFlag flags, bool service, Owner owner, uint16 vlw_flag, uint32 id);
 void VehicleEnterDepot(Vehicle *v);
 
 bool CanBuildVehicleInfrastructure(VehicleType type);