diff --git a/src/Plugin/CKEditorPlugin/FontCKEditorButton.php b/src/Plugin/CKEditorPlugin/FontCKEditorButton.php
index 35cd7a7..979772b 100644
--- a/src/Plugin/CKEditorPlugin/FontCKEditorButton.php
+++ b/src/Plugin/CKEditorPlugin/FontCKEditorButton.php
@@ -59,7 +59,7 @@ class FontCKEditorButton extends CKEditorPluginBase implements CKEditorPluginCon
     // https://git.drupalcode.org/project/drupal/commit/1edf15f
     // -----------------------------------------------------------------------
     // Search sites/<domain>/*.
-    $directories[] = \Drupal::service('site.path') . "/libraries/";
+    $directories[] = \Drupal::getContainer()->getParameter('site.path') . "/libraries/";
 
     // Always search the root 'libraries' directory.
     $directories[] = 'libraries/';