diff --git a/lib/redcarpet/render/gitlab_html.rb b/lib/redcarpet/render/gitlab_html.rb
index 42f6316910a..2e18b0592b5 100644
--- a/lib/redcarpet/render/gitlab_html.rb
+++ b/lib/redcarpet/render/gitlab_html.rb
@@ -24,7 +24,7 @@ class Redcarpet::Render::GitlabHTML < Redcarpet::Render::HTML
 
 <div class="highlighted-data #{h.user_color_scheme_class}">
   <div class="highlight">
-    <pre><code class="#{language}">#{code}</code></pre>
+    <pre><code class="#{language}">#{h.send(:html_escape, code)}</code></pre>
   </div>
 </div>