diff --git a/plugins/ActivityPub/Util/Model/Note.php b/plugins/ActivityPub/Util/Model/Note.php
index a4080fe276..adf98d618b 100644
--- a/plugins/ActivityPub/Util/Model/Note.php
+++ b/plugins/ActivityPub/Util/Model/Note.php
@@ -466,6 +466,9 @@ class Note extends Model
             ];
         }
 
+        // Language
+        $attr['@context'][] = ['@language' => $object->getLanguageLocale() ?? 'und'];
+
         $type = self::jsonToType($attr);
         Event::handle('ActivityPubAddActivityStreamsTwoData', [$type->get('type'), &$type]);
         return $type->toJson($options);