diff --git a/include/linux/tty.h b/include/linux/tty.h
index 1488d8c..e8c6c91 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -394,6 +394,7 @@
 extern void disassociate_ctty(int priv);
 extern void no_tty(void);
 extern void tty_flip_buffer_push(struct tty_struct *tty);
+extern void tty_flush_to_ldisc(struct tty_struct *tty);
 extern void tty_buffer_free_all(struct tty_struct *tty);
 extern void tty_buffer_flush(struct tty_struct *tty);
 extern void tty_buffer_init(struct tty_struct *tty);