diff --git a/headers/os/drivers/PCI.h b/headers/os/drivers/PCI.h
index bda37c9be3..d76a69b5a6 100644
--- a/headers/os/drivers/PCI.h
+++ b/headers/os/drivers/PCI.h
@@ -522,6 +522,7 @@ struct pci_module_info {
 #define PCI_usb_uhci			0x00	/* Universal Host Controller Interface */
 #define PCI_usb_ohci			0x10	/* Open Host Controller Interface */
 #define PCI_usb_ehci			0x20	/* Enhanced Host Controller Interface */
+#define PCI_usb_xhci			0x30	/* Extensible Host Controller Interface */
 
 /* ---
 	values for the class_sub field for class_base = 0x0d (wireless controller)