diff --git a/sys/dev/sound/macio/aoa.c b/sys/dev/sound/macio/aoa.c
index 04a29d3030b..3ba1bfaf727 100644
--- a/sys/dev/sound/macio/aoa.c
+++ b/sys/dev/sound/macio/aoa.c
@@ -369,7 +369,7 @@ aoa_attach(void *xsc)
 	char status[SND_STATUSLEN];
 	struct aoa_softc *sc;
 	device_t self;
-	int err;
+	int err __unused;
 
 	sc = xsc;
 	self = sc->sc_dev;