--- a/src/proto/gui_gtk.pro
+++ b/src/proto/gui_gtk.pro
@@ -14,6 +14,7 @@ void gui_mch_destroy_scrollbar __ARGS((s
 char_u *gui_mch_browse __ARGS((int saving, char_u *title, char_u *dflt, char_u *ext, char_u *initdir, char_u *filter));
 char_u *gui_mch_browsedir __ARGS((char_u *title, char_u *initdir));
 int gui_mch_dialog __ARGS((int type, char_u *title, char_u *message, char_u *buttons, int def_but, char_u *textfield));
+int gui_mch_dialog __ARGS((int type, char_u *title, char_u *message, char_u *buttons, int def_but, char_u *textfield));
 void gui_mch_show_popupmenu __ARGS((vimmenu_T *menu));
 void gui_make_popup __ARGS((char_u *path_name));
 void gui_mch_find_dialog __ARGS((exarg_T *eap));