diff --git a/core/modules/rdf/rdf.module b/core/modules/rdf/rdf.module
index 1dfde6a..c3fce4f 100644
--- a/core/modules/rdf/rdf.module
+++ b/core/modules/rdf/rdf.module
@@ -498,15 +498,14 @@ function rdf_preprocess_comment(&$variables) {
   }
   // Adds RDF metadata markup above comment body.
   if (!empty($variables['rdf_metadata_attributes'])) {
-    $prefix = '';
-    if (!empty($variables['content']['comment_body']['#prefix'])) {
-      $prefix = SafeMarkup::checkAdminXss($variables['content']['comment_body']['#prefix']);
-    }
     $rdf_metadata = array(
       '#theme' => 'rdf_metadata',
       '#metadata' => $variables['rdf_metadata_attributes'],
     );
-    $variables['content']['comment_body']['#prefix'] = SafeMarkup::set(drupal_render($rdf_metadata) . $prefix);
+    if (!empty($variables['content']['comment_body']['#prefix'])) {
+      $rdf_metadata['#suffix'] = $variables['content']['comment_body']['#prefix'];
+    }
+    $variables['content']['comment_body']['#prefix'] = drupal_render($rdf_metadata);
   }
 }