diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 77b68eaf021e..6a0f2f07f955 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -435,7 +435,7 @@ static int msi_capability_init(struct pci_dev *dev, int nvec)
 static void __iomem *msix_map_region(struct pci_dev *dev, unsigned pos,
 							unsigned nr_entries)
 {
-	unsigned long phys_addr;
+	resource_size_t phys_addr;
 	u32 table_offset;
 	u8 bir;