diff --git a/drivers/net/slip/slip.c b/drivers/net/slip/slip.c
index cc63102ca96e0056ac8f1755c5b43b7bd878ccf0..8940417c30e547556d1f02c459ffad7b348ae6bf 100644
--- a/drivers/net/slip/slip.c
+++ b/drivers/net/slip/slip.c
@@ -731,7 +731,7 @@ static void sl_sync(void)
 
 
 /* Find a free SLIP channel, and link in this `tty' line. */
-static struct slip *sl_alloc(dev_t line)
+static struct slip *sl_alloc(void)
 {
 	int i;
 	char name[IFNAMSIZ];
@@ -809,7 +809,7 @@ static int slip_open(struct tty_struct *tty)
 
 	/* OK.  Find a free SLIP channel to use. */
 	err = -ENFILE;
-	sl = sl_alloc(tty_devnum(tty));
+	sl = sl_alloc();
 	if (sl == NULL)
 		goto err_exit;