diff --git a/gtk2_ardour/color_theme_manager.cc b/gtk2_ardour/color_theme_manager.cc
index 15347c2b68..037554cf3e 100644
--- a/gtk2_ardour/color_theme_manager.cc
+++ b/gtk2_ardour/color_theme_manager.cc
@@ -629,6 +629,7 @@ ColorThemeManager::on_color_theme_changed ()
 
 		if (row) {
 			string new_theme = row[color_theme_columns.path];
+			UIConfiguration::instance().color_aliases.clear ();
 			UIConfiguration::instance().set_color_file (new_theme);
 		}
 	}