diff --git a/admin_manual/installation/harden_server.rst b/admin_manual/installation/harden_server.rst
index 2ccec6f7e28..39d65dc371a 100644
--- a/admin_manual/installation/harden_server.rst
+++ b/admin_manual/installation/harden_server.rst
@@ -140,7 +140,7 @@ VirtualHost file::
  <VirtualHost *:443>
    ServerName cloud.nextcloud.com
      <IfModule mod_headers.c>
-       Header always set Strict-Transport-Security "max-age=15552000; includeSubDomains"
+       Header always set Strict-Transport-Security "max-age=31536000; includeSubDomains"
      </IfModule>
   </VirtualHost>