diff --git a/sys/dev/sound/pcm/channel.h b/sys/dev/sound/pcm/channel.h
--- a/sys/dev/sound/pcm/channel.h
+++ b/sys/dev/sound/pcm/channel.h
@@ -225,7 +225,7 @@
 #define CHN_INSERT_SORT(w, x, y, z)		do {			\
 	struct pcm_channel *t, *a = NULL;				\
 	CHN_FOREACH(t, x, z) {						\
-		if ((y)->type w t->type)				\
+		if ((y)->type w t->type && (y)->unit w t->unit)		\
 			a = t;						\
 		else							\
 			break;						\