diff --git a/nginx/nginx.conf b/nginx/nginx.conf
index b500901e..9148c293 100644
--- a/nginx/nginx.conf
+++ b/nginx/nginx.conf
@@ -309,7 +309,7 @@ http {
         root /srv/mta-sts;
 
         include snippets/security-headers.conf;
-        add_header Cross-Origin-Resource-Policy "same-origin";
+        add_header Cross-Origin-Resource-Policy "same-origin" always;
     }
 
     server {