diff --git a/src/proto/gui_w16.pro b/src/proto/gui_w16.pro
index 4ca3ded..6a22c3e 100644
--- a/src/proto/gui_w16.pro
+++ b/src/proto/gui_w16.pro
@@ -34,6 +34,10 @@
 extern long_u gui_mch_get_rgb __ARGS((guicolor_T pixel));
 extern void gui_mch_activate_window __ARGS((void));
 extern void gui_mch_show_toolbar __ARGS((int showit));
+extern void gui_mch_show_tabline __ARGS((int showit));
+extern int gui_mch_showing_tabline __ARGS((void));
+extern void gui_mch_update_tabline __ARGS((void));
+extern void gui_mch_set_curtab __ARGS((int nr));
 extern void ex_simalt __ARGS((exarg_T *eap));
 extern void gui_mch_find_dialog __ARGS((exarg_T *eap));
 extern void gui_mch_replace_dialog __ARGS((exarg_T *eap));
diff --git a/src/proto/gui_w32.pro b/src/proto/gui_w32.pro
index 9e41156..731636d 100644
--- a/src/proto/gui_w32.pro
+++ b/src/proto/gui_w32.pro
@@ -34,6 +34,10 @@
 extern long_u gui_mch_get_rgb __ARGS((guicolor_T pixel));
 extern void gui_mch_activate_window __ARGS((void));
 extern void gui_mch_show_toolbar __ARGS((int showit));
+extern void gui_mch_show_tabline __ARGS((int showit));
+extern int gui_mch_showing_tabline __ARGS((void));
+extern void gui_mch_update_tabline __ARGS((void));
+extern void gui_mch_set_curtab __ARGS((int nr));
 extern void ex_simalt __ARGS((exarg_T *eap));
 extern void gui_mch_find_dialog __ARGS((exarg_T *eap));
 extern void gui_mch_replace_dialog __ARGS((exarg_T *eap));