diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index 739ea86..da9fde8 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -236,7 +236,7 @@
 }
 
 /* Delete file from its tty */
-void tty_del_file(struct file *file)
+static void tty_del_file(struct file *file)
 {
 	struct tty_file_private *priv = file->private_data;
 
@@ -554,7 +554,7 @@
  *		  tasklist_lock to walk task list for hangup event
  *		    ->siglock to protect ->signal/->sighand
  */
-void __tty_hangup(struct tty_struct *tty)
+static void __tty_hangup(struct tty_struct *tty)
 {
 	struct file *cons_filp = NULL;
 	struct file *filp, *f = NULL;