diff --git a/drivers/usb/serial/mos7840.c b/drivers/usb/serial/mos7840.c
index 009c1d9..748bc6a 100644
--- a/drivers/usb/serial/mos7840.c
+++ b/drivers/usb/serial/mos7840.c
@@ -2755,6 +2755,7 @@ static void mos7840_release(struct usb_serial *serial)
 				del_timer_sync(&mos7840_port->led_timer1);
 				del_timer_sync(&mos7840_port->led_timer2);
 			}
+			usb_free_urb(mos7840_port->control_urb);
 			kfree(mos7840_port->ctrl_buf);
 			kfree(mos7840_port->dr);
 			kfree(mos7840_port);