diff --git a/src/engine_func.h b/src/engine_func.h
--- a/src/engine_func.h
+++ b/src/engine_func.h
@@ -26,7 +26,7 @@ extern const uint8 _engine_offsets[4];
 
 bool IsEngineBuildable(EngineID engine, VehicleType type, CompanyID company);
 bool IsEngineRefittable(EngineID engine);
-void GetArticulatedVehicleCargoesAndRefits(EngineID engine, CargoArray *cargoes, uint32 *refits);
+void GetArticulatedVehicleCargoesAndRefits(EngineID engine, CargoArray *cargoes, CargoTypes *refits);
 void SetYearEngineAgingStops();
 void StartupOneEngine(Engine *e, Date aging_date);