diff --git a/benchmark/etc/attribute_builder.haml b/benchmark/etc/attribute_builder.haml
index f1ac413e..7c607e10 100644
--- a/benchmark/etc/attribute_builder.haml
+++ b/benchmark/etc/attribute_builder.haml
@@ -1,5 +1,5 @@
 - h = { 'user' => { id: 1234, name: 'eagletmt' }, book_id: 5432 }
 - c = %w[content active]
 
-%span{data: h}
+%span.book{data: h, class: c}
   Book