diff --git a/drivers/usb/serial/quatech2.c b/drivers/usb/serial/quatech2.c
index 2df8ad5ede8900e35b1d4584930abfbf5f6fac25..85acb50a7ee2f4fe74ae26dc3dc96611cbd9d918 100644
--- a/drivers/usb/serial/quatech2.c
+++ b/drivers/usb/serial/quatech2.c
@@ -141,6 +141,7 @@ static void qt2_release(struct usb_serial *serial)
 
 	serial_priv = usb_get_serial_data(serial);
 
+	usb_kill_urb(serial_priv->read_urb);
 	usb_free_urb(serial_priv->read_urb);
 	kfree(serial_priv->read_buffer);
 	kfree(serial_priv);