diff --git a/include/linux/usb/serial.h b/include/linux/usb/serial.h
index c786ee7fca8f..b9b0f7b4e43b 100644
--- a/include/linux/usb/serial.h
+++ b/include/linux/usb/serial.h
@@ -68,7 +68,6 @@
  *	port.
  * @flags: usb serial port flags
  * @write_wait: a wait_queue_head_t used by the port.
- * @delta_msr_wait: modem-status-change wait queue
  * @work: work queue entry for the line discipline waking up.
  * @throttled: nonzero if the read urb is inactive to throttle the device
  * @throttle_req: nonzero if the tty wants to throttle us
@@ -116,7 +115,6 @@ struct usb_serial_port {
 
 	unsigned long		flags;
 	wait_queue_head_t	write_wait;
-	wait_queue_head_t	delta_msr_wait;
 	struct work_struct	work;
 	char			throttled;
 	char			throttle_req;