diff --git a/Rakefile b/Rakefile
index 42c56e3..01d885c 100644
--- a/Rakefile
+++ b/Rakefile
@@ -14,6 +14,7 @@ task :test do
   Rake::Task['spec'].invoke
   HTMLProofer.check_directory('./_site',
                               check_html: true,
+                              enforce_https: true,
                               validation: { ignore_script_embeds: true },
                               url_swap: { %r{https://choosealicense.com} => '' },
                               hydra: { max_concurrency: 10 },