diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index bbddf492da9f..548045dda97c 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -1380,7 +1380,7 @@ irq_hw_number_t pci_msi_domain_calc_hwirq(struct pci_dev *dev,
 {
 	return (irq_hw_number_t)desc->msi_attrib.entry_nr |
 		PCI_DEVID(dev->bus->number, dev->devfn) << 11 |
-		(pci_domain_nr(dev->bus) & 0xFFFFFFFF) << 27;
+		((irq_hw_number_t)(pci_domain_nr(dev->bus) & 0xFFFFFFFF)) << 27;
 }
 
 static inline bool pci_msi_desc_is_multi_msi(struct msi_desc *desc)