diff --git a/drivers/iio/adc/ad_sigma_delta.c b/drivers/iio/adc/ad_sigma_delta.c
index 533667eefe41..71e775a10a91 100644
--- a/drivers/iio/adc/ad_sigma_delta.c
+++ b/drivers/iio/adc/ad_sigma_delta.c
@@ -378,7 +378,7 @@ static int ad_sd_buffer_postenable(struct iio_dev *indio_dev)
 			return ret;
 	}
 
-	samples_buf_size = ALIGN(slot * indio_dev->channels[0].scan_type.storagebits, 8);
+	samples_buf_size = ALIGN(slot * indio_dev->channels[0].scan_type.storagebits / 8, 8);
 	samples_buf_size += sizeof(int64_t);
 	samples_buf = devm_krealloc(&sigma_delta->spi->dev, sigma_delta->samples_buf,
 				    samples_buf_size, GFP_KERNEL);