diff --git a/demos/modules/gaudio/oscilloscope/gfxconf.h b/demos/modules/gaudio/oscilloscope/gfxconf.h
index 2caa1da9..8e20ce0b 100644
--- a/demos/modules/gaudio/oscilloscope/gfxconf.h
+++ b/demos/modules/gaudio/oscilloscope/gfxconf.h
@@ -45,7 +45,6 @@
 #define GFX_USE_GDISP			TRUE
 #define GFX_USE_GWIN			TRUE
 #define GFX_USE_GTIMER			TRUE
-//#define GFX_USE_GADC			TRUE
 #define GFX_USE_GAUDIO			TRUE
 
 /* Features for the GDISP sub-system. */
diff --git a/drivers/gaudio/gadc/driver.mk b/drivers/gaudio/gadc/driver.mk
index 4d79da25..8e943577 100644
--- a/drivers/gaudio/gadc/driver.mk
+++ b/drivers/gaudio/gadc/driver.mk
@@ -3,3 +3,7 @@ GFXSRC += $(GFXLIB)/drivers/gaudio/gadc/gaudio_record_lld.c
 
 # Required include directories
 GFXINC += $(GFXLIB)/drivers/gaudio/gadc
+
+# Make sure the GADC sub-system is turned on
+GFXDEFS += -DGFX_USE_GADC=TRUE
+