diff --git a/rtgui/include/rtgui/widgets/radiobox.h b/rtgui/include/rtgui/widgets/radiobox.h
index f2b8f0bf502fb6ba1cbfc8f578f2e170605659ba..a0ffd095a3fef1e5d2a1ae29387f9a1d97cdf879 100644
--- a/rtgui/include/rtgui/widgets/radiobox.h
+++ b/rtgui/include/rtgui/widgets/radiobox.h
@@ -25,7 +25,8 @@ struct rtgui_radiobox
 	rt_uint8_t item_size;
 
 	char** items;
-	rt_uint16_t item_count, item_selection;
+	rt_uint16_t item_count;
+	rt_int16_t  item_selection;
 };
 typedef struct rtgui_radiobox rtgui_radiobox_t;