diff --git a/[refs] b/[refs]
index 59a7d42057ae..3069bfaf392c 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 72fda3ca6fc14662bb385d1e39e9e00af15b200d
+refs/heads/master: 238ebd138c9704e1162030c1e600bc06142cb2c8
diff --git a/trunk/drivers/usb/serial/sierra.c b/trunk/drivers/usb/serial/sierra.c
index f494c5f659e2..9d11fe47633b 100644
--- a/trunk/drivers/usb/serial/sierra.c
+++ b/trunk/drivers/usb/serial/sierra.c
@@ -17,7 +17,7 @@
   Whom based his on the Keyspan driver by Hugh Blemings <hugh@blemings.org>
 */
 
-#define DRIVER_VERSION "v.1.3.6"
+#define DRIVER_VERSION "v.1.3.7"
 #define DRIVER_AUTHOR "Kevin Lloyd, Elina Pasheva, Matthew Safar, Rory Filer"
 #define DRIVER_DESC "USB Driver for Sierra Wireless USB modems"
 
@@ -474,6 +474,9 @@ static int sierra_write(struct tty_struct *tty, struct usb_serial_port *port,
 					  port->bulk_out_endpointAddress),
 			  buffer, writesize, sierra_outdat_callback, port);
 
+	/* Handle the need to send a zero length packet */
+	urb->transfer_flags |= URB_ZERO_PACKET;
+
 	/* send it down the pipe */
 	retval = usb_submit_urb(urb, GFP_ATOMIC);
 	if (retval) {