diff --git a/core/modules/filter/src/Plugin/Filter/FilterCaption.php b/core/modules/filter/src/Plugin/Filter/FilterCaption.php
index ed241d8..95ce6dc 100644
--- a/core/modules/filter/src/Plugin/Filter/FilterCaption.php
+++ b/core/modules/filter/src/Plugin/Filter/FilterCaption.php
@@ -59,7 +59,7 @@ public function process($text, $langcode) {
         $node->removeAttribute('class');
         $filter_caption = array(
           '#theme' => 'filter_caption',
-          '#node' => SafeMarkup::set($node->C14N()),
+          '#node' => $node->C14N(),
           '#tag' => $node->tagName,
           '#caption' => $caption,
           '#classes' => $classes,