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