diff --git a/config/nginx.conf.erb b/config/nginx.conf.erb
index 06c5566..e5d9415 100644
--- a/config/nginx.conf.erb
+++ b/config/nginx.conf.erb
@@ -454,7 +454,7 @@ http {
         include force_https.conf;
         proxy_hide_header Cache-Control;
         proxy_hide_header Expires;
-        add_header Cache-Control "public, max-age=0, s-maxage=0";
+        add_header Cache-Control "$implied_cache_control";
         proxy_pass https://gh-pages.rubykaigi.org;
     }