diff --git a/arch/arm/src/nrf52/nrf52_adc.c b/arch/arm/src/nrf52/nrf52_adc.c
index 4e141869b4..1b82fdfa54 100644
--- a/arch/arm/src/nrf52/nrf52_adc.c
+++ b/arch/arm/src/nrf52/nrf52_adc.c
@@ -912,8 +912,8 @@ static int nrf52_adc_ioctl(FAR struct adc_dev_s *dev, int cmd,
  *
  ****************************************************************************/
 
-struct adc_dev_s *nrf52_adcinitialize(FAR struct nrf52_adc_channel_s *chan,
-                                      int channels)
+struct adc_dev_s *nrf52_adcinitialize(
+    FAR const struct nrf52_adc_channel_s *chan, int channels)
 {
   FAR struct adc_dev_s   *dev  = NULL;
   FAR struct nrf52_adc_s *priv = NULL;
diff --git a/arch/arm/src/nrf52/nrf52_adc.h b/arch/arm/src/nrf52/nrf52_adc.h
index 53bef1c43b..28d3d6c86d 100644
--- a/arch/arm/src/nrf52/nrf52_adc.h
+++ b/arch/arm/src/nrf52/nrf52_adc.h
@@ -155,7 +155,8 @@ struct nrf52_adc_channel_s
  *
  ****************************************************************************/
 
-struct adc_dev_s *nrf52_adcinitialize(FAR struct nrf52_adc_channel_s *chan,
-                                      int channels);
+struct adc_dev_s *nrf52_adcinitialize(
+    FAR const struct nrf52_adc_channel_s *chan,
+    int channels);
 
 #endif  /* __ARCH_ARM_SRC_NRF52_NRF52_ADC_H */