diff --git a/drivers/staging/iio/adc/max1363_ring.c b/drivers/staging/iio/adc/max1363_ring.c
index 85fde751a154..c8aa01109ec2 100644
--- a/drivers/staging/iio/adc/max1363_ring.c
+++ b/drivers/staging/iio/adc/max1363_ring.c
@@ -142,7 +142,7 @@ static int max1363_ring_predisable(struct iio_dev *indio_dev)
  * then.  Some triggers will generate their own time stamp.  Currently
  * there is no way of notifying them when no one cares.
  **/
-void max1363_poll_func_th(struct iio_dev *indio_dev)
+static void max1363_poll_func_th(struct iio_dev *indio_dev)
 {
 	struct max1363_state *st = indio_dev->dev_data;