diff --git a/src/proto/window.pro b/src/proto/window.pro
index 6bc5f7e..7b019a7 100644
--- a/src/proto/window.pro
+++ b/src/proto/window.pro
@@ -14,6 +14,7 @@
 win_T *winframe_remove __ARGS((win_T *win, int *dirp, tabpage_T *tp));
 void close_others __ARGS((int message, int forceit));
 void curwin_init __ARGS((void));
+void win_init_empty __ARGS((win_T *wp));
 int win_alloc_first __ARGS((void));
 void win_alloc_aucmd_win __ARGS((void));
 void win_init_size __ARGS((void));