diff --git a/Polyhedron/demo/Polyhedron/MainWindow.cpp b/Polyhedron/demo/Polyhedron/MainWindow.cpp
index 54cfde41e68..d4365323f33 100644
--- a/Polyhedron/demo/Polyhedron/MainWindow.cpp
+++ b/Polyhedron/demo/Polyhedron/MainWindow.cpp
@@ -1015,7 +1015,7 @@ void MainWindow::open(QString filename)
     Q_FOREACH(CGAL::Three::Polyhedron_demo_io_plugin_interface* io_plugin, io_plugins) {
       if ( !io_plugin->canLoad() ) continue;
       all_items << io_plugin->name();
-      if ( file_matches_filter(io_plugin->loadNameFilters(), filename) )
+      if ( file_matches_filter(io_plugin->loadNameFilters(), filename.toLower()) )
         selected_items << io_plugin->name();
     }
   }
@@ -1642,7 +1642,7 @@ void MainWindow::save(QString filename, CGAL::Three::Scene_item* item) {
   bool saved = false;
   Q_FOREACH(CGAL::Three::Polyhedron_demo_io_plugin_interface* plugin, io_plugins) {
     if(  plugin->canSave(item) &&
-        file_matches_filter(plugin->saveNameFilters(),filename) )
+        file_matches_filter(plugin->saveNameFilters(),filename.toLower()) )
     {
       if(plugin->save(item, fileinfo))
       {