diff --git a/drivers/iio/adc/mcp3911.c b/drivers/iio/adc/mcp3911.c
index dd52f08ec82e..624ec5b075e5 100644
--- a/drivers/iio/adc/mcp3911.c
+++ b/drivers/iio/adc/mcp3911.c
@@ -111,6 +111,8 @@ static int mcp3911_read_raw(struct iio_dev *indio_dev,
 		if (ret)
 			goto out;
 
+		*val = sign_extend32(*val, 23);
+
 		ret = IIO_VAL_INT;
 		break;