diff --git a/src/proto/option.pro b/src/proto/option.pro
index 3da0e94..8c9bde5 100644
--- a/src/proto/option.pro
+++ b/src/proto/option.pro
@@ -64,4 +64,5 @@
 void find_mps_values(int *initc, int *findc, int *backwards, int switchit);
 unsigned int get_bkc_value(buf_T *buf);
 int signcolumn_on(win_T *wp);
+dict_T *get_winbuf_options(int bufopt);
 /* vim: set ft=c : */