diff --git a/sys/dev/sound/dummy.c b/sys/dev/sound/dummy.c
--- a/sys/dev/sound/dummy.c
+++ b/sys/dev/sound/dummy.c
@@ -327,6 +327,7 @@
 	struct dummy_softc *sc = device_get_softc(dev);
 	int err;
 
+	callout_drain(&sc->callout);
 	err = pcm_unregister(dev);
 	snd_mtxfree(sc->lock);