diff --git a/plugins/DummyPlugin.php b/plugins/DummyPlugin.php
index 60f2f35..6c2a85b 100644
--- a/plugins/DummyPlugin.php
+++ b/plugins/DummyPlugin.php
@@ -11,7 +11,7 @@
  * @license http://opensource.org/licenses/MIT
  * @version 1.0
  */
-class DummyPlugin extends AbstractPicoPlugin
+final class DummyPlugin extends AbstractPicoPlugin
 {
     /**
      * This plugin is enabled by default?