diff --git a/configuration/hosts/hainich/services/codimd.nix b/configuration/hosts/hainich/services/codimd.nix
index 7749b93..a513ada 100644
--- a/configuration/hosts/hainich/services/codimd.nix
+++ b/configuration/hosts/hainich/services/codimd.nix
@@ -72,7 +72,7 @@
         proxy_set_header X-Forwarded-Host $http_host;
         proxy_set_header Upgrade $http_upgrade;
         proxy_set_header Connection $http_connection;
-        proxy_add_header Access-Control-Allow-Origin "https://stuebinm.4future.de";
+        add_header Access-Control-Allow-Origin "https://stuebinm.4future.de";
         proxy_buffering off;
       '';
     };