diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 13bbe5795e4e..9bb8d64b6f94 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -1534,7 +1534,7 @@ static const struct attribute_group *amd_iommu_groups[] = {
 	NULL,
 };
 
-static int iommu_init_pci(struct amd_iommu *iommu)
+static int __init iommu_init_pci(struct amd_iommu *iommu)
 {
 	int cap_ptr = iommu->cap_ptr;
 	u32 range, misc, low, high;