diff --git a/src/build_vehicle_gui.cpp b/src/build_vehicle_gui.cpp
--- a/src/build_vehicle_gui.cpp
+++ b/src/build_vehicle_gui.cpp
@@ -920,8 +920,7 @@ void TestedEngineDetails::FillDefaultCap
 int DrawVehiclePurchaseInfo(int left, int right, int y, EngineID engine_number, TestedEngineDetails &te)
 {
 	const Engine *e = Engine::Get(engine_number);
-	TimerGameCalendar::YearMonthDay ymd;
-	TimerGameCalendar::ConvertDateToYMD(e->intro_date, &ymd);
+	TimerGameCalendar::YearMonthDay ymd = TimerGameCalendar::ConvertDateToYMD(e->intro_date);
 	bool refittable = IsArticulatedVehicleRefittable(engine_number);
 	bool articulated_cargo = false;