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
@@ -967,7 +967,7 @@ int DrawVehiclePurchaseInfo(int left, in
 	if (e->type != VEH_TRAIN || e->u.rail.railveh_type != RAILVEH_WAGON) {
 		/* Design date - Life length */
 		SetDParam(0, ymd.year);
-		SetDParam(1, DateToYear(e->GetLifeLengthInDays()));
+		SetDParam(1, TimerGameCalendar::DateToYear(e->GetLifeLengthInDays()));
 		DrawString(left, right, y, STR_PURCHASE_INFO_DESIGNED_LIFE);
 		y += FONT_HEIGHT_NORMAL;