diff --git a/include/linux/usb/serial.h b/include/linux/usb/serial.h
index c17eb64..ce911eb 100644
--- a/include/linux/usb/serial.h
+++ b/include/linux/usb/serial.h
@@ -150,6 +150,7 @@
 	struct usb_interface		*interface;
 	unsigned char			disconnected:1;
 	unsigned char			suspending:1;
+	unsigned char			attached:1;
 	unsigned char			minor;
 	unsigned char			num_ports;
 	unsigned char			num_port_pointers;