diff --git a/test/md_test.exs b/test/md_test.exs
index f6195bb..2ac0a84 100644
--- a/test/md_test.exs
+++ b/test/md_test.exs
@@ -212,7 +212,7 @@ defmodule MdTest do
     assert [
              {:pre, nil,
               [
-                {:code, %{class: "html"},
+                {:code, %{class: "html lang-html"},
                  ["<div>\n  <p>foo</p>\n</div>\n"]}
               ]}
            ] ==