diff --git a/lib/docs/filters/gcc/clean_html.rb b/lib/docs/filters/gcc/clean_html.rb
index 14639b3e..5606514c 100644
--- a/lib/docs/filters/gcc/clean_html.rb
+++ b/lib/docs/filters/gcc/clean_html.rb
@@ -5,6 +5,7 @@ module Docs
css('pre').each do |node|
node['data-language'] = 'cpp'
end
+
doc
end
end