diff --git a/music/null_m.h b/music/null_m.h
--- a/music/null_m.h
+++ b/music/null_m.h
@@ -3,7 +3,7 @@
 #ifndef MUSIC_NULL_H
 #define MUSIC_NULL_H
 
-#include "hal.h"
+#include "../hal.h"
 
 extern const HalMusicDriver _null_music_driver;