diff --git a/src/Bundle/ChillMainBundle/Templating/ChillMarkdownRenderExtension.php b/src/Bundle/ChillMainBundle/Templating/ChillMarkdownRenderExtension.php
index 8615150c3..a3b32ec18 100644
--- a/src/Bundle/ChillMainBundle/Templating/ChillMarkdownRenderExtension.php
+++ b/src/Bundle/ChillMainBundle/Templating/ChillMarkdownRenderExtension.php
@@ -26,7 +26,7 @@ use Parsedown;
  * Render markdown
  * 
  */
-class ChillMarkdownRenderExtension extends AbstractExtension
+final class ChillMarkdownRenderExtension extends AbstractExtension
 {
     /**
      *