diff --git a/drivers/usb/serial/io_ti.c b/drivers/usb/serial/io_ti.c
index 989795ab064a..c315836793b3 100644
--- a/drivers/usb/serial/io_ti.c
+++ b/drivers/usb/serial/io_ti.c
@@ -2747,6 +2747,7 @@ static struct usb_serial_driver edgeport_1port_device = {
 	.description		= "Edgeport TI 1 port adapter",
 	.id_table		= edgeport_1port_id_table,
 	.num_ports		= 1,
+	.num_bulk_out		= 1,
 	.open			= edge_open,
 	.close			= edge_close,
 	.throttle		= edge_throttle,
@@ -2785,6 +2786,7 @@ static struct usb_serial_driver edgeport_2port_device = {
 	.description		= "Edgeport TI 2 port adapter",
 	.id_table		= edgeport_2port_id_table,
 	.num_ports		= 2,
+	.num_bulk_out		= 1,
 	.open			= edge_open,
 	.close			= edge_close,
 	.throttle		= edge_throttle,