diff --git a/drivers/iommu/fsl_pamu.c b/drivers/iommu/fsl_pamu.c
index b99dd88e31b9..5c9b42494bc4 100644
--- a/drivers/iommu/fsl_pamu.c
+++ b/drivers/iommu/fsl_pamu.c
@@ -92,7 +92,7 @@ struct gen_pool *spaace_pool;
  * subwindow count per liodn.
  *
  */
-u32 pamu_get_max_subwin_cnt()
+u32 pamu_get_max_subwin_cnt(void)
 {
 	return max_subwindow_count;
 }
diff --git a/drivers/iommu/fsl_pamu_domain.c b/drivers/iommu/fsl_pamu_domain.c
index 0009dffe8000..8f42e8ec4d76 100644
--- a/drivers/iommu/fsl_pamu_domain.c
+++ b/drivers/iommu/fsl_pamu_domain.c
@@ -1156,7 +1156,7 @@ static struct iommu_ops fsl_pamu_ops = {
 	.remove_device	= fsl_pamu_remove_device,
 };
 
-int pamu_domain_init()
+int pamu_domain_init(void)
 {
 	int ret = 0;