diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c
index ec9b0449ccf6658bbd013ef3a18989a34f1afcf2..e3440003810e4b8ddd73376b9cdd9f9540d14e50 100644
--- a/drivers/usb/serial/cp210x.c
+++ b/drivers/usb/serial/cp210x.c
@@ -138,6 +138,7 @@ static struct usb_serial_driver cp210x_device = {
 	.usb_driver		= &cp210x_driver,
 	.id_table		= id_table,
 	.num_ports		= 1,
+	.bulk_out_size		= 256,
 	.open			= cp210x_open,
 	.close			= cp210x_close,
 	.break_ctl		= cp210x_break_ctl,