diff --git a/hw/pci-host/apb.c b/hw/pci-host/apb.c
index 54edbddb03..44b08c090e 100644
--- a/hw/pci-host/apb.c
+++ b/hw/pci-host/apb.c
@@ -523,10 +523,10 @@ static int pci_pbmA_map_irq(PCIDevice *pci_dev, int irq_num)
     switch (PCI_SLOT(pci_dev->devfn)) {
     case 1:
         /* Onboard NIC */
-        return 0x21;
+        return OBIO_NIC_IRQ;
     case 3:
         /* Onboard IDE */
-        return 0x20;
+        return OBIO_HDD_IRQ;
     default:
         /* Normal intno, fall through */
         break;
diff --git a/include/hw/pci-host/apb.h b/include/hw/pci-host/apb.h
index 09ebd53f60..6194c8cbad 100644
--- a/include/hw/pci-host/apb.h
+++ b/include/hw/pci-host/apb.h
@@ -53,6 +53,8 @@ typedef struct IOMMUState {
 #define MAX_IVEC 0x40
 
 /* OBIO IVEC IRQs */
+#define OBIO_HDD_IRQ         0x20
+#define OBIO_NIC_IRQ         0x21
 #define OBIO_LPT_IRQ         0x22
 #define OBIO_FDD_IRQ         0x27
 #define OBIO_KBD_IRQ         0x29