diff --git a/components/rtgui/include/rtgui/widgets/widget.h b/components/rtgui/include/rtgui/widgets/widget.h
index cc410ac93c58d0640f673df93f467b465a8d9f66..a43d3f7cb725c974d6ed7a0500890baefec9a2a2 100644
--- a/components/rtgui/include/rtgui/widgets/widget.h
+++ b/components/rtgui/include/rtgui/widgets/widget.h
@@ -106,6 +106,9 @@ struct rtgui_widget
 	rt_bool_t (*on_size)		(struct rtgui_widget* widget, struct rtgui_event* event);
 	rt_bool_t (*on_command)		(struct rtgui_widget* widget, struct rtgui_event* event);
 #endif
+
+	/* user private data */
+	rt_uint32_t user_data;
 };
 typedef struct rtgui_widget rtgui_widget_t;