diff --git a/gtk2_ardour/mixer_ui.cc b/gtk2_ardour/mixer_ui.cc
index ac12d5a21f..41cb6c76b2 100644
--- a/gtk2_ardour/mixer_ui.cc
+++ b/gtk2_ardour/mixer_ui.cc
@@ -133,7 +133,7 @@ Mixer_UI::instance ()
 }
 
 Mixer_UI::Mixer_UI ()
-	: Tabbable (_("Mixer"), X_("mixer"), NULL, true, Profile->get_mixbus () ? Tabbable::PaneRightBtm : Tabbable::PaneLeft)
+	: Tabbable (_("Mixer"), X_("mixer"), NULL, true, Profile->get_mixbus () ? Tabbable::PaneLayout (Tabbable::AttBottom | Tabbable::PaneRight) : Tabbable::PaneLeft)
 	, plugin_search_clear_button (X_("Clear"))
 	, _mixer_scene_release (0)
 	, no_track_list_redisplay (false)
diff --git a/gtk2_ardour/public_editor.cc b/gtk2_ardour/public_editor.cc
index 83f4b47e51..7c500bb716 100644
--- a/gtk2_ardour/public_editor.cc
+++ b/gtk2_ardour/public_editor.cc
@@ -33,7 +33,7 @@ ARDOUR::DataType PublicEditor::pbdid_dragged_dt = ARDOUR::DataType::NIL;
 
 PublicEditor::PublicEditor ()
 	: EditingContext (X_("Editor"))
-	, Tabbable (_("Editor"), X_("editor"), NULL, true, Tabbable::PaneLayout (Tabbable::AttLeft | Tabbable::PaneRightBtm))
+	, Tabbable (_("Editor"), X_("editor"), NULL, true, Tabbable::PaneLayout (Tabbable::AttLeft | Tabbable::AttBottom | Tabbable::PaneRight))
 {
 	_suspend_route_redisplay_counter.store (0);
 }