diff --git a/src/proto/gui_x11.pro b/src/proto/gui_x11.pro
index d4eb2d9..2d2eafa 100644
--- a/src/proto/gui_x11.pro
+++ b/src/proto/gui_x11.pro
@@ -53,6 +53,7 @@
 void gui_mch_menu_hidden(vimmenu_T *menu, int hidden);
 void gui_mch_draw_menubar(void);
 void gui_x11_menu_cb(Widget w, XtPointer client_data, XtPointer call_data);
+int gui_mch_is_blinking(void);
 void gui_mch_set_blinking(long waittime, long on, long off);
 void gui_mch_stop_blink(void);
 void gui_mch_start_blink(void);