diff --git a/hosts/freifunk/default.nix b/hosts/freifunk/default.nix
index 16460335..726df1a8 100644
--- a/hosts/freifunk/default.nix
+++ b/hosts/freifunk/default.nix
@@ -482,7 +482,7 @@ in {
           sysinfo-json = {
             alias = "/run/nginx/sysinfo.json";
             extraConfig = ''
-              add_header Content-Type "application/json;charset=UTF-8";
+              default_type application/json;charset=UTF-8;
             '';
           };
         in {