diff --git a/Packages/Largest_empty_rect_2/changes.txt b/Packages/Largest_empty_rect_2/changes.txt
index 476b7bd2beb..1b45e042af9 100644
--- a/Packages/Largest_empty_rect_2/changes.txt
+++ b/Packages/Largest_empty_rect_2/changes.txt
@@ -1,3 +1,6 @@
+version 1.43 [rursu]
+- Qt_help_window class is in the CGAL namespace
+
 version 1.42 [rursu]
 - demo use the new help class Qt_help_window instead of HelpWindow
 - demo use the new demoicon
diff --git a/Packages/Largest_empty_rect_2/demo/Largest_empty_rect_2/largest_empty_rect_2.C b/Packages/Largest_empty_rect_2/demo/Largest_empty_rect_2/largest_empty_rect_2.C
index afa56067543..96774b5bbf9 100644
--- a/Packages/Largest_empty_rect_2/demo/Largest_empty_rect_2/largest_empty_rect_2.C
+++ b/Packages/Largest_empty_rect_2/demo/Largest_empty_rect_2/largest_empty_rect_2.C
@@ -215,7 +215,8 @@ private slots:
   void howto(){
     QString home;
     home = "help/index.html";
-    Qt_help_window *help = new Qt_help_window(home, ".", 0, "help viewer");
+    CGAL::Qt_help_window *help = new 
+      CGAL::Qt_help_window(home, ".", 0, "help viewer");
     help->resize(400, 400);
     help->setCaption("Demo HowTo");
     help->show();