diff --git a/src/osk_gui.cpp b/src/osk_gui.cpp
--- a/src/osk_gui.cpp
+++ b/src/osk_gui.cpp
@@ -394,7 +394,7 @@ static const WindowDesc _osk_desc(
 	WDP_CENTER, WDP_CENTER, 256, 140, 256, 140,
 	WC_OSK, WC_NONE,
 	WDF_STD_TOOLTIPS | WDF_STD_BTN | WDF_DEF_WIDGET | WDF_UNCLICK_BUTTONS,
-	NULL, _nested_osk_widgets, lengthof(_nested_osk_widgets)
+	_nested_osk_widgets, lengthof(_nested_osk_widgets)
 );
 
 /**