diff --git a/drivers/net/hamradio/6pack.c b/drivers/net/hamradio/6pack.c
index f9e3be96963cde79ded8cd0b556294a6bd9987ec..b59c65b9645be21df12bb24c0fd7c2cd99799043 100644
--- a/drivers/net/hamradio/6pack.c
+++ b/drivers/net/hamradio/6pack.c
@@ -668,6 +668,9 @@ static int sixpack_open(struct tty_struct *tty)
 	netif_start_queue(dev);
 
 	init_timer(&sp->tx_t);
+	sp->tx_t.function = sp_xmit_on_air;
+	sp->tx_t.data = (unsigned long) sp;
+
 	init_timer(&sp->resync_t);
 
 	spin_unlock_bh(&sp->lock);