diff --git a/src/proto/gui_gtk_x11.pro b/src/proto/gui_gtk_x11.pro
index 3fa2ac9..459cdb9 100644
--- a/src/proto/gui_gtk_x11.pro
+++ b/src/proto/gui_gtk_x11.pro
@@ -37,6 +37,7 @@
 GuiFont gui_mch_get_font(char_u *name, int report_error);
 char_u *gui_mch_get_fontname(GuiFont font, char_u *name);
 void gui_mch_free_font(GuiFont font);
+void gui_mch_expand_font(optexpand_T *args, void *param, int (*cb)(char_u *val));
 guicolor_T gui_mch_get_color(char_u *name);
 guicolor_T gui_mch_get_rgb_color(int r, int g, int b);
 void gui_mch_set_fg_color(guicolor_T color);
diff --git a/src/proto/optionstr.pro b/src/proto/optionstr.pro
index 48cccea..88034fc 100644
--- a/src/proto/optionstr.pro
+++ b/src/proto/optionstr.pro
@@ -152,6 +152,7 @@
 int expand_set_foldmethod(optexpand_T *args, int *numMatches, char_u ***matches);
 int expand_set_foldopen(optexpand_T *args, int *numMatches, char_u ***matches);
 int expand_set_formatoptions(optexpand_T *args, int *numMatches, char_u ***matches);
+int expand_set_guifont(optexpand_T *args, int *numMatches, char_u ***matches);
 int expand_set_guioptions(optexpand_T *args, int *numMatches, char_u ***matches);
 int expand_set_highlight(optexpand_T *args, int *numMatches, char_u ***matches);
 int expand_set_jumpoptions(optexpand_T *args, int *numMatches, char_u ***matches);
diff --git a/src/proto/os_mswin.pro b/src/proto/os_mswin.pro
index d9172ee..9f534e0 100644
--- a/src/proto/os_mswin.pro
+++ b/src/proto/os_mswin.pro
@@ -51,5 +51,6 @@
 char *charset_id2name(int id);
 char *quality_id2name(DWORD id);
 int get_logfont(LOGFONTW *lf, char_u *name, HDC printer_dc, int verbose);
+void gui_mch_expand_font(optexpand_T *args, void *param, int (*cb)(char_u *val));
 void channel_init_winsock(void);
 /* vim: set ft=c : */