diff --git a/conf/nginx.conf b/conf/nginx.conf
index 8faded4..8252c0b 100644
--- a/conf/nginx.conf
+++ b/conf/nginx.conf
@@ -13,7 +13,7 @@ location __PATH__ {
 
   location __PATH__/assets/ {
     expires max;
-    add_header Cache-Control public;
+    more_set_headers 'Cache-Control: public';
   }
 
 # Include SSOWAT user panel.