diff --git a/conf/nginx.conf b/conf/nginx.conf
index bf700f0..d5d8b95 100644
--- a/conf/nginx.conf
+++ b/conf/nginx.conf
@@ -37,5 +37,5 @@ location / {
 }
 
 location ~ ^/media {
-    add_header Content-Security-Policy "script-src 'none';";
+    more_set_headers Content-Security-Policy "script-src 'none';";
 }