diff --git a/drivers/pci/host/pci-ftpci100.c b/drivers/pci/host/pci-ftpci100.c
index 3f5d224e7b1a8d04aac64b452e264bc75e9915c2..96028f01bc90142e50ef3b8ce5d85e6775f1e619 100644
--- a/drivers/pci/host/pci-ftpci100.c
+++ b/drivers/pci/host/pci-ftpci100.c
@@ -355,7 +355,7 @@ static int faraday_pci_setup_cascaded_irq(struct faraday_pci *p)
 		return irq ?: -EINVAL;
 	}
 
-	p->irqdomain = irq_domain_add_linear(intc, 4,
+	p->irqdomain = irq_domain_add_linear(intc, PCI_NUM_INTX,
 					     &faraday_pci_irqdomain_ops, p);
 	if (!p->irqdomain) {
 		dev_err(p->dev, "failed to create Gemini PCI IRQ domain\n");