diff --git a/demos/modules/gwin/widgets/gfxconf.h b/demos/modules/gwin/widgets/gfxconf.h
index 10db7bbc..9ca5580b 100644
--- a/demos/modules/gwin/widgets/gfxconf.h
+++ b/demos/modules/gwin/widgets/gfxconf.h
@@ -47,7 +47,7 @@
 #define GDISP_NEED_CIRCLE			TRUE
 #define GDISP_NEED_ELLIPSE			FALSE
 #define GDISP_NEED_ARC				FALSE
-#define GDISP_NEED_CONVEX_POLYGON	FALSE
+#define GDISP_NEED_CONVEX_POLYGON	TRUE
 #define GDISP_NEED_SCROLL			FALSE
 #define GDISP_NEED_PIXELREAD		FALSE
 #define GDISP_NEED_CONTROL			FALSE