diff --git a/src/include/ipxe/virtio-pci.h b/src/include/ipxe/virtio-pci.h
index c7452c82f..f3c9b17ca 100644
--- a/src/include/ipxe/virtio-pci.h
+++ b/src/include/ipxe/virtio-pci.h
@@ -107,11 +107,11 @@ struct virtio_pci_region {
 /* How to interpret the base field */
 #define VIRTIO_PCI_REGION_TYPE_MASK  0x00000003
 /* The base field is a memory address */
-#define VIRTIO_PCI_REGION_MEMORY     0x00000000
+#define VIRTIO_PCI_REGION_MEMORY     0x00000001
 /* The base field is a port address */
-#define VIRTIO_PCI_REGION_PORT       0x00000001
+#define VIRTIO_PCI_REGION_PORT       0x00000002
 /* The base field is an offset within the PCI bar */
-#define VIRTIO_PCI_REGION_PCI_CONFIG 0x00000002
+#define VIRTIO_PCI_REGION_PCI_CONFIG 0x00000003
     unsigned flags;
 };