diff --git a/sys/dev/sound/pcm/buffer.c b/sys/dev/sound/pcm/buffer.c
index 5a83d6b5ba9f..8e00e62007a0 100644
--- a/sys/dev/sound/pcm/buffer.c
+++ b/sys/dev/sound/pcm/buffer.c
@@ -307,7 +307,7 @@ sndbuf_getbuf(struct snd_dbuf *b)
 void *
 sndbuf_getbufofs(struct snd_dbuf *b, unsigned int ofs)
 {
-	KASSERT(ofs <= b->bufsize, ("%s: ofs invalid %d", __func__, ofs));
+	KASSERT(ofs < b->bufsize, ("%s: ofs invalid %d", __func__, ofs));
 
 	return b->buf + ofs;
 }