diff --git a/lib/github/markup/markdown.rb b/lib/github/markup/markdown.rb
index 11cf662d..7952bd3b 100644
--- a/lib/github/markup/markdown.rb
+++ b/lib/github/markup/markdown.rb
@@ -6,7 +6,8 @@ class Markdown < Implementation
       MARKDOWN_GEMS = {
         "commonmarker" => proc { |content, options: {}|
           commonmarker_opts = [:GITHUB_PRE_LANG].concat(options.fetch(:commonmarker_opts, []))
-          CommonMarker.render_html(content, commonmarker_opts, [:tagfilter, :autolink, :table, :strikethrough])
+          commonmarker_exts = options.fetch(:commonmarker_exts, [:tagfilter, :autolink, :table, :strikethrough])
+          CommonMarker.render_html(content, commonmarker_opts, commonmarker_exts)
         },
         "github/markdown" => proc { |content, options: {}|
           GitHub::Markdown.render(content)
diff --git a/test/markup_test.rb b/test/markup_test.rb
index 1ff2272a..da859944 100644
--- a/test/markup_test.rb
+++ b/test/markup_test.rb
@@ -120,5 +120,8 @@ def test_commonmarker_options
 
     assert_equal "<p>hello <!-- raw HTML omitted --> world</p>\n", GitHub::Markup.render_s(GitHub::Markups::MARKUP_MARKDOWN, "hello <bad> world")
     assert_equal "<p>hello <bad> world</p>\n", GitHub::Markup.render_s(GitHub::Markups::MARKUP_MARKDOWN, "hello <bad> world", options: {commonmarker_opts: [:UNSAFE]})
+
+    assert_equal "&lt;style>.red{color: #ff2727;}&lt;/style>\n", GitHub::Markup.render("test.md", "<style>.red{color: #ff2727;}</style>", options: {commonmarker_opts: [:UNSAFE]})
+    assert_equal "<style>.red{color: #ff2727;}</style>\n", GitHub::Markup.render_s(GitHub::Markups::MARKUP_MARKDOWN, "<style>.red{color: #ff2727;}</style>", options: {commonmarker_opts: [:UNSAFE], commonmarker_exts: [:autolink, :table, :strikethrough]})
   end
 end