--- a/mysql-workbench-gpl/frontend/linux/linux_utilities/toolbar_manager.cpp
+++ b/mysql-workbench-gpl/frontend/linux/linux_utilities/toolbar_manager.cpp
@@ -31,7 +31,7 @@ static Gtk::ComboBox *create_color_combo(const std::vector<std::string> &colors,
   }
 
   Glib::RefPtr<Gtk::ListStore> model= Gtk::ListStore::create(*color_combo_columns);
-  Gtk::ComboBox *combo= new Gtk::ComboBox(model);
+  Gtk::ComboBox *combo= new Gtk::ComboBox( Glib::RefPtr<Gtk::TreeModel>(model) );
 
   combo->pack_start(color_combo_columns->image);