diff --git a/drivers/iio/adc/stm32-adc.c b/drivers/iio/adc/stm32-adc.c
index f7613efb870d..0b3e487440a6 100644
--- a/drivers/iio/adc/stm32-adc.c
+++ b/drivers/iio/adc/stm32-adc.c
@@ -2234,6 +2234,7 @@ static int stm32_adc_generic_chan_init(struct iio_dev *indio_dev,
 			if (vin[0] != val || vin[1] >= adc_info->max_channels) {
 				dev_err(&indio_dev->dev, "Invalid channel in%d-in%d\n",
 					vin[0], vin[1]);
+				ret = -EINVAL;
 				goto err;
 			}
 		} else if (ret != -EINVAL) {