diff --git a/drivers/usb/serial/ti_usb_3410_5052.c b/drivers/usb/serial/ti_usb_3410_5052.c
index 3107bf5d1c96..e16558b63fcc 100644
--- a/drivers/usb/serial/ti_usb_3410_5052.c
+++ b/drivers/usb/serial/ti_usb_3410_5052.c
@@ -427,6 +427,7 @@ static struct usb_serial_driver ti_1port_device = {
 	.description		= "TI USB 3410 1 port adapter",
 	.id_table		= ti_id_table_3410,
 	.num_ports		= 1,
+	.num_bulk_out		= 1,
 	.attach			= ti_startup,
 	.release		= ti_release,
 	.port_probe		= ti_port_probe,
@@ -459,6 +460,7 @@ static struct usb_serial_driver ti_2port_device = {
 	.description		= "TI USB 5052 2 port adapter",
 	.id_table		= ti_id_table_5052,
 	.num_ports		= 2,
+	.num_bulk_out		= 1,
 	.attach			= ti_startup,
 	.release		= ti_release,
 	.port_probe		= ti_port_probe,