diff --git a/src/autoreplace_gui.cpp b/src/autoreplace_gui.cpp
--- a/src/autoreplace_gui.cpp
+++ b/src/autoreplace_gui.cpp
@@ -528,7 +528,7 @@ static const WindowDesc _replace_rail_ve
 	WDP_AUTO, WDP_AUTO, 456, 140, 456, 140,
 	WC_REPLACE_VEHICLE, WC_NONE,
 	WDF_STD_TOOLTIPS | WDF_STD_BTN | WDF_DEF_WIDGET | WDF_UNCLICK_BUTTONS | WDF_STICKY_BUTTON | WDF_RESIZABLE | WDF_CONSTRUCTION,
-	NULL, _nested_replace_rail_vehicle_widgets, lengthof(_nested_replace_rail_vehicle_widgets)
+	_nested_replace_rail_vehicle_widgets, lengthof(_nested_replace_rail_vehicle_widgets)
 );
 
 static const NWidgetPart _nested_replace_vehicle_widgets[] = {
@@ -559,7 +559,7 @@ static const WindowDesc _replace_vehicle
 	WDP_AUTO, WDP_AUTO, 456, 118, 456, 118,
 	WC_REPLACE_VEHICLE, WC_NONE,
 	WDF_STD_TOOLTIPS | WDF_STD_BTN | WDF_DEF_WIDGET | WDF_UNCLICK_BUTTONS | WDF_STICKY_BUTTON | WDF_RESIZABLE | WDF_CONSTRUCTION,
-	NULL, _nested_replace_vehicle_widgets, lengthof(_nested_replace_vehicle_widgets)
+	_nested_replace_vehicle_widgets, lengthof(_nested_replace_vehicle_widgets)
 );
 
 void ShowReplaceGroupVehicleWindow(GroupID id_g, VehicleType vehicletype)