diff --git a/src/proto/window.pro b/src/proto/window.pro
index 97a25df..0ec5734 100644
--- a/src/proto/window.pro
+++ b/src/proto/window.pro
@@ -7,7 +7,7 @@
 int check_split_disallowed(win_T *wp);
 int win_split(int size, int flags);
 int win_splitmove(win_T *wp, int size, int flags);
-int win_split_ins(int size, int flags, win_T *new_wp, int dir);
+int win_split_ins(int size, int flags, win_T *new_wp, int dir, frame_T *to_flatten);
 int win_valid_popup(win_T *win);
 int win_valid(win_T *win);
 win_T *win_find_by_id(int id);
@@ -28,7 +28,7 @@
 void may_trigger_win_scrolled_resized(void);
 void win_close_othertab(win_T *win, int free_buf, tabpage_T *tp);
 void win_free_all(void);
-win_T *winframe_remove(win_T *win, int *dirp, tabpage_T *tp);
+win_T *winframe_remove(win_T *win, int *dirp, tabpage_T *tp, frame_T **to_flatten);
 void close_others(int message, int forceit);
 void unuse_tabpage(tabpage_T *tp);
 void use_tabpage(tabpage_T *tp);