diff --git a/docs/_snippets/features/build-text-alignment-source.js b/docs/_snippets/features/build-text-alignment-source.js
index b75b5c4..879d33f 100644
--- a/docs/_snippets/features/build-text-alignment-source.js
+++ b/docs/_snippets/features/build-text-alignment-source.js
@@ -9,6 +9,6 @@ import ClassicEditor from '@ckeditor/ckeditor5-build-classic/src/ckeditor';
 
 import Alignment from '@ckeditor/ckeditor5-alignment/src/alignment';
 
-ClassicEditor.build.plugins.push( Alignment );
+ClassicEditor.builtinPlugins.push( Alignment );
 
 window.ClassicEditor = ClassicEditor;