diff --git a/file_browser.module b/file_browser.module
index be663a3..d79e359 100644
--- a/file_browser.module
+++ b/file_browser.module
@@ -37,7 +37,7 @@ function file_browser_form_alter(&$form, FormStateInterface &$form_state) {
       $form['actions_wrap'] = [
         '#type' => 'container',
         '#attributes' => [
-          'class' => 'file-browser-actions',
+          'class' => array('file-browser-actions'),
         ],
       ];