diff --git a/engine/src/core/com/jme3/system/AppSettings.java b/engine/src/core/com/jme3/system/AppSettings.java
index 80656bf5e..c6f47ae71 100644
--- a/engine/src/core/com/jme3/system/AppSettings.java
+++ b/engine/src/core/com/jme3/system/AppSettings.java
@@ -51,7 +51,7 @@ import java.util.prefs.Preferences;
  * 
  * @author Kirill Vainer
  */
-public class AppSettings extends HashMap<String, Object> {
+public final class AppSettings extends HashMap<String, Object> {
 
     private static final AppSettings defaults = new AppSettings(false);