diff --git a/src/open9x.h b/src/open9x.h
index a03a139b4..e22a0207b 100644
--- a/src/open9x.h
+++ b/src/open9x.h
@@ -722,7 +722,7 @@ void read_9_adc(void ) ;
 #define __BACKLIGHT_OFF PORTB &= ~(1 << OUT_B_LIGHT)
 #endif
 
-#if defined(PCBSTD) && defined(VOICE)
+#if defined(PCBSTD) && defined(VOICE) && not defined(SIMU)
 #define BACKLIGHT_ON    (Voice.Backlight = 1)
 #define BACKLIGHT_OFF   (Voice.Backlight = 0)
 #else