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
@@ -1187,7 +1187,7 @@ static const WindowDesc _build_vehicle_d
 	WDP_AUTO, WDP_AUTO, 240, 186, 240, 268,
 	WC_BUILD_VEHICLE, WC_NONE,
 	WDF_STD_TOOLTIPS | WDF_STD_BTN | WDF_DEF_WIDGET | WDF_UNCLICK_BUTTONS | WDF_RESIZABLE | WDF_CONSTRUCTION,
-	NULL, _nested_build_vehicle_widgets, lengthof(_nested_build_vehicle_widgets)
+	_nested_build_vehicle_widgets, lengthof(_nested_build_vehicle_widgets)
 );
 
 void ShowBuildVehicleWindow(TileIndex tile, VehicleType type)