diff --git a/boring-nginx/headers_params b/boring-nginx/headers_params
index 1f3c409..831747a 100644
--- a/boring-nginx/headers_params
+++ b/boring-nginx/headers_params
@@ -1,4 +1,4 @@
-add_header Strict-Transport-Security "max-age=31536000; includeSubdomains; preload";
+add_header Strict-Transport-Security "max-age=31536000; includeSubDomains; preload";
 add_header X-Frame-Options SAMEORIGIN;
 add_header X-Content-Type-Options nosniff;
 add_header X-XSS-Protection "1; mode=block";