diff --git a/sys/dev/usb/serial/u3g.c b/sys/dev/usb/serial/u3g.c
index 88f94ddaecc..28a403a846b 100644
--- a/sys/dev/usb/serial/u3g.c
+++ b/sys/dev/usb/serial/u3g.c
@@ -568,6 +568,7 @@ static const STRUCT_USB_HOST_ID u3g_devs[] = {
 	U3G_DEV(SIERRA, MC5728, 0),
 	U3G_DEV(SIERRA, MC7354, 0),
 	U3G_DEV(SIERRA, MC7355, 0),
+	U3G_DEV(SIERRA, AC340U, 0),
 	U3G_DEV(SIERRA, MC7430, 0),
 	U3G_DEV(SIERRA, MC8700, 0),
 	U3G_DEV(SIERRA, MC8755, 0),
diff --git a/sys/dev/usb/usbdevs b/sys/dev/usb/usbdevs
index 2a217b1eaf1..39bfd258502 100644
--- a/sys/dev/usb/usbdevs
+++ b/sys/dev/usb/usbdevs
@@ -4363,6 +4363,7 @@ product SIERRA E6893		0x6893	E6893
 product SIERRA MC8700		0x68A3	MC8700
 product SIERRA MC7354		0x68C0	MC7354
 product SIERRA MC7355		0x9041	MC7355
+product SIERRA AC340U		0x9051	Sierra Wireless AirCard 340U
 product SIERRA MC7430		0x9071	Sierra Wireless MC7430 Qualcomm Snapdragon X7 LTE-A
 product SIERRA AC313U		0x68aa	Sierra Wireless AirCard 313U
 product SIERRA TRUINSTALL	0x0fff	Aircard Tru Installer