diff --git a/gtk2_ardour/editor_mixer.cc b/gtk2_ardour/editor_mixer.cc
index 3c871cdc95..4e58dafe0d 100644
--- a/gtk2_ardour/editor_mixer.cc
+++ b/gtk2_ardour/editor_mixer.cc
@@ -137,8 +137,7 @@ Editor::show_editor_mixer (bool yn)
 		}
 
 		if (current_mixer_strip && current_mixer_strip->get_parent() == 0) {
-			content_hbox.pack_start (*current_mixer_strip, Gtk::PACK_SHRINK );
-			content_hbox.reorder_child (*current_mixer_strip, 0);
+			content_att_left.add (*current_mixer_strip);
 			current_mixer_strip->show ();
 		}
 
@@ -151,7 +150,7 @@ Editor::show_editor_mixer (bool yn)
 
 		if (current_mixer_strip) {
 			if (current_mixer_strip->get_parent() != 0) {
-				content_hbox.remove (*current_mixer_strip);
+				content_att_left.remove ();
 			}
 		}
 	}