--- a/drivers/usb/serial/sierra.c
+++ b/drivers/usb/serial/sierra.c
@@ -205,6 +205,7 @@
 	{ USB_DEVICE(0x1199, 0x6832) },	/* Sierra Wireless MC8780*/
 	{ USB_DEVICE(0x1199, 0x6833) },	/* Sierra Wireless MC8781*/
 	{ USB_DEVICE(0x1199, 0x683B), .driver_info = DEVICE_1_PORT },	/* Sierra Wireless MC8785 Composite*/
+	{ USB_DEVICE(0x1199, 0x683C), .driver_info = DEVICE_1_PORT },	/* Sierra Wireless MC8790 Composite*/
 	{ USB_DEVICE(0x1199, 0x6850) },	/* Sierra Wireless AirCard 880 */
 	{ USB_DEVICE(0x1199, 0x6851) },	/* Sierra Wireless AirCard 881 */
 	{ USB_DEVICE(0x1199, 0x6852) },	/* Sierra Wireless AirCard 880 E */
