diff -ruN gtkmm-3-22.old/gtk/src/menuitem.ccg gtkmm-3-22.new/gtk/src/menuitem.ccg
--- gtkmm-3-22.old/gtk/src/menuitem.ccg	2018-02-08 20:09:55.000000000 +0100
+++ gtkmm-3-22.new/gtk/src/menuitem.ccg	2018-02-08 20:10:46.000000000 +0100
@@ -48,17 +48,9 @@
 
 void MenuItem::add_accel_label(const Glib::ustring& label, bool mnemonic)
 {
-  auto pLabel = manage(new AccelLabel(label, mnemonic));
-
-  //Labels are centered by default, but in menus they should be left-aligned.
-  pLabel->set_halign(ALIGN_START);
-
-  add(*pLabel);
-
-  //Note that we have to unset the accel_widget in  MenuList::remove() to avoid
-  //a memory leak due to the extra reference:
-  pLabel->set_accel_widget(*this);
-  pLabel->show();
+  GtkMenuItem* menu_item = (GtkMenuItem*) gobj();
+  gtk_menu_item_set_label(menu_item, label.c_str());
+  gtk_menu_item_set_use_underline(menu_item, mnemonic);
 }
 
 void MenuItem::set_accel_key(const AccelKey& accel_key)