diff --git a/src/Plugin/Filter/Markdown.php b/src/Plugin/Filter/Markdown.php
index e1333b3..952104c 100644
--- a/src/Plugin/Filter/Markdown.php
+++ b/src/Plugin/Filter/Markdown.php
@@ -84,7 +84,7 @@ class Markdown extends FilterBase {
     if (!empty($text)) {
       switch ($this->settings['markdown_library']) {
         case 'commonmark':
-          $converter = new League\CommonMark\CommonMarkConverter();
+          $converter = new CommonMarkConverter();
           $text = $converter->convertToHtml($text);
           break;
         case 'php-markdown':