diff --git a/src/proto/window.pro b/src/proto/window.pro
index 72612b8..cfb771d 100644
--- a/src/proto/window.pro
+++ b/src/proto/window.pro
@@ -81,6 +81,7 @@
 void command_height(void);
 void last_status(int morewin);
 int tabline_height(void);
+int last_stl_height(int morewin);
 int min_rows(void);
 int only_one_window(void);
 void check_lnums(int do_curwin);