diff --git a/sys/dev/sound/pcm/dsp.c b/sys/dev/sound/pcm/dsp.c
index 6677ce4..283d067 100644
--- a/sys/dev/sound/pcm/dsp.c
+++ b/sys/dev/sound/pcm/dsp.c
@@ -589,8 +589,6 @@ dsp_open(struct dev_open_args *ap)
 				pcm_chnrelease(rdch);
 			}
 		} else {
-			if (flags & O_NONBLOCK)
-				rdch->flags |= CHN_F_NBIO;
 			if (flags & O_EXCL)
 				rdch->flags |= CHN_F_EXCLUSIVE;
 			pcm_chnref(rdch, 1);
@@ -636,8 +634,6 @@ dsp_open(struct dev_open_args *ap)
 				pcm_chnrelease(wrch);
 			}
 		} else {
-			if (flags & O_NONBLOCK)
-				wrch->flags |= CHN_F_NBIO;
 			if (flags & O_EXCL)
 				wrch->flags |= CHN_F_EXCLUSIVE;
 			pcm_chnref(wrch, 1);