diff --git a/configuration/server/cdn/cdn-master.nix b/configuration/server/cdn/cdn-master.nix
index 28842a3..7dff0be 100644
--- a/configuration/server/cdn/cdn-master.nix
+++ b/configuration/server/cdn/cdn-master.nix
@@ -30,7 +30,7 @@ in {
             proxy_ignore_headers Cache-Control;
             proxy_cache_valid any 30m;
             auth_basic off;
-            add_header 'Access-Control-Allow-Origin' '*';
+            add_header \'Access-Control-Allow-Origin\' \'*\';
           '';
         };
       };