diff --git a/sys/dev/sound/usb/uaudio.c b/sys/dev/sound/usb/uaudio.c
index a14cdf805353..06e2bd85cb88 100644
--- a/sys/dev/sound/usb/uaudio.c
+++ b/sys/dev/sound/usb/uaudio.c
@@ -1243,6 +1243,11 @@ uaudio_detach_sub(device_t dev)
 	struct uaudio_softc *sc = device_get_softc(device_get_parent(dev));
 	unsigned i = uaudio_get_child_index_by_dev(sc, dev);
 	int error = 0;
+	struct snddev_info *d;
+	struct pcm_channel *ch;
+	struct proc *p;
+
+	d = device_get_softc(dev);
 
 repeat:
 	if (sc->sc_child[i].pcm_registered) {
@@ -1255,6 +1260,20 @@ uaudio_detach_sub(device_t dev)
 	if (error) {
 		device_printf(dev, "Waiting for sound application to exit!\n");
 		usb_pause_mtx(NULL, 2 * hz);
+		/* try to kill pid before repeating */
+
+		CHN_FOREACH(ch, d, channels.pcm) {
+			CHN_LOCK(ch);
+			if (ch->refcount > 0) {
+				device_printf(dev, "unregister attempt to kill "
+				    " pid %d\n", ch->pid);
+				if ((p = pfind(ch->pid)) != NULL) {
+					kern_psignal(p, SIGKILL);
+					PROC_UNLOCK(p);
+				}
+			}
+			CHN_UNLOCK(ch);
+		}
 		goto repeat;		/* try again */
 	}
 	return (0);			/* success */