diff --git a/demos/modules/audio/oscilloscope/gfxconf.h b/demos/modules/audio/oscilloscope/gfxconf.h
index 8af25391..8733268d 100644
--- a/demos/modules/audio/oscilloscope/gfxconf.h
+++ b/demos/modules/audio/oscilloscope/gfxconf.h
@@ -47,7 +47,6 @@
 #define GFX_USE_GTIMER			TRUE
 //#define GFX_USE_GADC			TRUE
 #define GFX_USE_GAUDIN			TRUE
-#define GFX_USE_GAUDOUT			TRUE
 
 /* Features for the GDISP sub-system. */
 #define GDISP_NEED_VALIDATION	TRUE