diff --git a/src/proto/buffer.pro b/src/proto/buffer.pro
index 1061e36..07ec64c 100644
--- a/src/proto/buffer.pro
+++ b/src/proto/buffer.pro
@@ -40,7 +40,7 @@
 void maketitle __ARGS((void));
 void resettitle __ARGS((void));
 void free_titles __ARGS((void));
-int build_stl_str_hl __ARGS((win_T *wp, char_u *out, size_t outlen, char_u *fmt, int fillchar, int maxwidth, struct stl_hlrec *hl));
+int build_stl_str_hl __ARGS((win_T *wp, char_u *out, size_t outlen, char_u *fmt, int insecure, int fillchar, int maxwidth, struct stl_hlrec *hl));
 void get_rel_pos __ARGS((win_T *wp, char_u *str));
 int append_arg_number __ARGS((win_T *wp, char_u *buf, int add_file, int maxlen));
 char_u *fix_fname __ARGS((char_u *fname));