diff --git a/Polyhedron/demo/Polyhedron/MainWindow.h b/Polyhedron/demo/Polyhedron/MainWindow.h
index 0689df3183e..73f605ecfdf 100644
--- a/Polyhedron/demo/Polyhedron/MainWindow.h
+++ b/Polyhedron/demo/Polyhedron/MainWindow.h
@@ -454,7 +454,7 @@ private:
   bool bbox_need_update;
   QMap<QString, QPair<QStringList, QString> >plugin_metadata_map;
   QMap<QString, bool> ignored_map;
-  const QStringList& accepted_keywords;
+  QStringList accepted_keywords;
 
 private:
   QMap<QAction*, QMenu*> action_menu_map;