diff --git a/Polyhedron/demo/Polyhedron/MainWindow.ui b/Polyhedron/demo/Polyhedron/MainWindow.ui
index c7ce7a2d053..82e34d9ea57 100644
--- a/Polyhedron/demo/Polyhedron/MainWindow.ui
+++ b/Polyhedron/demo/Polyhedron/MainWindow.ui
@@ -636,7 +636,7 @@
   </action>
   <action name="actionPreferences">
    <property name="text">
-    <string>Preferences</string>
+    <string>&amp;Preferences</string>
    </property>
   </action>
  </widget>