diff --git a/drivers/iio/adc/ad4080.c b/drivers/iio/adc/ad4080.c
index 8d2953341b15..8feb0c7f7fcb 100644
--- a/drivers/iio/adc/ad4080.c
+++ b/drivers/iio/adc/ad4080.c
@@ -698,6 +698,11 @@ static int ad4080_setup_channel(struct ad4080_state *st, unsigned int ch)
 	if (ret)
 		return ret;
 
+	ret = iio_backend_data_size_set(st->back[ch],
+					st->info->channels[0].scan_type.realbits);
+	if (ret)
+		return ret;
+
 	if (!st->lvds_cnv_en)
 		return 0;