diff --git a/lib/vty.h b/lib/vty.h
index abac3dd..806f2c6 100644
--- a/lib/vty.h
+++ b/lib/vty.h
@@ -237,7 +237,7 @@
 extern void vty_terminate (void);
 extern void vty_reset (void);
 extern struct vty *vty_new (void);
-extern struct vty *vty_stdio (void);
+extern struct vty *vty_stdio (void (*atclose)(void));
 extern int vty_out (struct vty *, const char *, ...) PRINTF_ATTRIBUTE(2, 3);
 extern void vty_read_config (char *, char *);
 extern void vty_time_print (struct vty *, int);