diff --git a/core/modules/rdf/rdf.module b/core/modules/rdf/rdf.module
index 20f9d38..3c6ac1e 100644
--- a/core/modules/rdf/rdf.module
+++ b/core/modules/rdf/rdf.module
@@ -367,7 +367,7 @@ function rdf_preprocess_user(&$variables) {
           'lang' => '',
         ),
       );
-      $build['#attached']['html_head'][] = [$username_meta, 'rdf_user_username'];
+      $variables['#attached']['html_head'][] = [$username_meta, 'rdf_user_username'];
     }
   }
 }