diff --git a/tmux.h b/tmux.h
index 762f0d26..2e1c8e1d 100644
--- a/tmux.h
+++ b/tmux.h
@@ -1827,9 +1827,7 @@ int	 screen_check_selection(struct screen *, u_int, u_int);
 
 /* window.c */
 extern struct windows windows;
-int		 window_cmp(struct window *, struct window *);
 int		 winlink_cmp(struct winlink *, struct winlink *);
-RB_PROTOTYPE(windows, window, entry, window_cmp);
 RB_PROTOTYPE(winlinks, winlink, entry, winlink_cmp);
 struct winlink	*winlink_find_by_index(struct winlinks *, int);
 struct winlink	*winlink_find_by_window(struct winlinks *, struct window *);