diff --git a/src/sound.c b/src/sound.c
index 9056610..0f9ffa0 100644
--- a/src/sound.c
+++ b/src/sound.c
@@ -31,6 +31,7 @@ extern struct sound_driver sound_bsd;
 extern struct sound_driver sound_beos;
 extern struct sound_driver sound_amiga;
 extern struct sound_driver sound_aix;
+extern struct sound_driver sound_ahi;
 
 LIST_HEAD(sound_driver_list);