diff --git a/drivers/iio/adc/vf610_adc.c b/drivers/iio/adc/vf610_adc.c
index 37f542e8233cea8cb01106875157b2df3733a5ea..44799eb5930e2e03e71f9a4381165447b62b839a 100644
--- a/drivers/iio/adc/vf610_adc.c
+++ b/drivers/iio/adc/vf610_adc.c
@@ -447,7 +447,7 @@ static int vf610_read_raw(struct iio_dev *indio_dev,
 {
 	struct vf610_adc *info = iio_priv(indio_dev);
 	unsigned int hc_cfg;
-	unsigned long ret;
+	long ret;
 
 	switch (mask) {
 	case IIO_CHAN_INFO_RAW: