diff --git a/drivers/iio/adc/ad7780.c b/drivers/iio/adc/ad7780.c
index a813fe04787c6009c6b2eb5ad327d27319fc9e5b..97b6774e7f5856d70c401f601d3d408dc836a073 100644
--- a/drivers/iio/adc/ad7780.c
+++ b/drivers/iio/adc/ad7780.c
@@ -152,7 +152,7 @@ static int ad7780_write_raw(struct iio_dev *indio_dev,
 
 	switch (m) {
 	case IIO_CHAN_INFO_SCALE:
-		if (val != 0)
+		if (val != 0 || val2 == 0)
 			return -EINVAL;
 
 		vref = st->int_vref_mv * 1000000LL;