diff --git a/drivers/net/hamradio/mkiss.c b/drivers/net/hamradio/mkiss.c
index 3249df5e0f179c46582154de56c0e7b7a701a81a..b8e25c4624d2c2db3d6e84bb90e7b7cd55261a6e 100644
--- a/drivers/net/hamradio/mkiss.c
+++ b/drivers/net/hamradio/mkiss.c
@@ -548,7 +548,7 @@ static int ax_xmit(struct sk_buff *skb, struct net_device *dev)
 		}
 
 		printk(KERN_ERR "mkiss: %s: transmit timed out, %s?\n", dev->name,
-		       (ax->tty->ops->chars_in_buffer(ax->tty) || ax->xleft) ?
+		       (tty_chars_in_buffer(ax->tty) || ax->xleft) ?
 		       "bad line quality" : "driver error");
 
 		ax->xleft = 0;