diff --git a/src/proto/gui_w32.pro b/src/proto/gui_w32.pro
index 58ad4f4..a953a1d 100644
--- a/src/proto/gui_w32.pro
+++ b/src/proto/gui_w32.pro
@@ -51,6 +51,7 @@
 void gui_mch_newfont __ARGS((void));
 void gui_mch_settitle __ARGS((char_u *title, char_u *icon));
 void mch_set_mouse_shape __ARGS((int shape));
+char_u *gui_mch_browsedir __ARGS((char_u *title, char_u *initdir));
 char_u *gui_mch_browse __ARGS((int saving, char_u *title, char_u *dflt, char_u *ext, char_u *initdir, char_u *filter));
 int get_cmd_args __ARGS((char *prog, char *cmdline, char ***argvp, char **tofree));
 int gui_is_win32s __ARGS((void));