diff --git a/vl.h b/vl.h
index 72d4f87..4f181c5 100644
--- a/vl.h
+++ b/vl.h
@@ -862,6 +862,17 @@
 
 #include "hw/usb.h"
 
+/* usb ports of the VM */
+
+#define MAX_VM_USB_PORTS 8
+
+extern USBPort *vm_usb_ports[MAX_VM_USB_PORTS];
+extern USBDevice *vm_usb_hub;
+
+void do_usb_add(const char *devname);
+void do_usb_del(const char *devname);
+void usb_info(void);
+
 #endif /* defined(QEMU_TOOL) */
 
 /* monitor.c */