diff --git a/sys/dev/sound/pcm/mixer.c b/sys/dev/sound/pcm/mixer.c
index 77d3e66e93f..8d71d7ebfb4 100644
--- a/sys/dev/sound/pcm/mixer.c
+++ b/sys/dev/sound/pcm/mixer.c
@@ -174,6 +174,7 @@ mixer_busy(snddev_info *d, int busy)
 {
 	if (d == NULL) return -1;
 	d->mixer.busy = busy;
+	return 0;
 }
 
 int