diff --git a/drivers/staging/comedi/drivers/dt282x.c b/drivers/staging/comedi/drivers/dt282x.c
index 9c512dac656793f74b49633cf92477055b1eb459..66f15aa55b7e94043091e68b1e3d010307a80ca1 100644
--- a/drivers/staging/comedi/drivers/dt282x.c
+++ b/drivers/staging/comedi/drivers/dt282x.c
@@ -1215,7 +1215,7 @@ static int dt282x_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 	s = &dev->subdevices[0];
 	s->type		= COMEDI_SUBD_AI;
 	s->subdev_flags	= SDF_READABLE;
-	if (it->options[4]) {
+	if ((it->options[4] && board->adchan_di) || board->adchan_se == 0) {
 		s->subdev_flags	|= SDF_DIFF;
 		s->n_chan	= board->adchan_di;
 	} else {