diff --git a/gtk2_ardour/ardour_ui_dialogs.cc b/gtk2_ardour/ardour_ui_dialogs.cc
index 487a7b94a4..2cfa27cbb2 100644
--- a/gtk2_ardour/ardour_ui_dialogs.cc
+++ b/gtk2_ardour/ardour_ui_dialogs.cc
@@ -574,18 +574,3 @@ ARDOUR_UI::editor_meter_peak_button_release (GdkEventButton* ev)
 	}
 	return true;
 }
-
-void
-ARDOUR_UI::toggle_mixer_space()
-{
-	Glib::RefPtr<Action> act = ActionManager::get_action ("Common", "ToggleMaximalMixer");
-
-	if (act) {
-		Glib::RefPtr<ToggleAction> tact = Glib::RefPtr<ToggleAction>::cast_dynamic(act);
-		if (tact->get_active()) {
-			mixer->maximise_mixer_space ();
-		} else {
-			mixer->restore_mixer_space ();
-		}
-	}
-}