diff --git a/roles/php_website/defaults/main.yml b/roles/php_website/defaults/main.yml
index e8bfbfb57e3d4ea6b5b799f607fc216a3fd5030f..1f8c5b4f17b2dbac5bc93cb8337622e7d0e55daf 100644
--- a/roles/php_website/defaults/main.yml
+++ b/roles/php_website/defaults/main.yml
@@ -10,6 +10,7 @@ rewrites: []
 additional_fpm_config: {}
 website_mail_recipients: "root"
 environment_indicator: null
+http_header_overrides: {}
 
 # Internal parameters.
 php_fpm_service_name_per_release: