diff --git a/sys/dev/sound/pcm/buffer.c b/sys/dev/sound/pcm/buffer.c
index 4de68997463..a925fb16003 100644
--- a/sys/dev/sound/pcm/buffer.c
+++ b/sys/dev/sound/pcm/buffer.c
@@ -141,7 +141,8 @@ sndbuf_free(struct snd_dbuf *b)
 		if (b->flags & SNDBUF_F_MANAGED) {
 			if (b->buf_addr)
 				bus_dmamap_unload(b->dmatag, b->dmamap);
-			bus_dmamem_free(b->dmatag, b->buf, b->dmamap);
+			if (b->dmatag)
+				bus_dmamem_free(b->dmatag, b->buf, b->dmamap);
 		} else
 			free(b->buf, M_DEVBUF);
 	}