diff --git a/demos/modules/gwin/graph/gfxconf.h b/demos/modules/gwin/graph/gfxconf.h
index bc65beea..b3b089ae 100644
--- a/demos/modules/gwin/graph/gfxconf.h
+++ b/demos/modules/gwin/graph/gfxconf.h
@@ -44,6 +44,7 @@
 /* Features for the GDISP sub-system. */
 #define GDISP_NEED_VALIDATION	TRUE
 #define GDISP_NEED_CLIP			TRUE
+#define GDISP_NEED_MULTITHREAD	TRUE
 
 /* Features for the GWIN subsystem. */
 #define GWIN_NEED_WINDOWMANAGER	TRUE