diff --git a/drivers/staging/comedi/drivers/rtd520.c b/drivers/staging/comedi/drivers/rtd520.c
index 1a62e8f249ae..888238e26073 100644
--- a/drivers/staging/comedi/drivers/rtd520.c
+++ b/drivers/staging/comedi/drivers/rtd520.c
@@ -623,7 +623,7 @@ static int ai_read_n(struct comedi_device *dev, struct comedi_subdevice *s,
 			d = comedi_offset_munge(s, d);
 		d &= s->maxdata;
 
-		if (!comedi_buf_put(s, d))
+		if (!comedi_buf_write_samples(s, &d, 1))
 			return -1;
 
 		if (devpriv->ai_count > 0)	/* < 0, means read forever */