diff --git a/hosts/c3d2-web/default.nix b/hosts/c3d2-web/default.nix
index 3c358d98..e46a81ef 100644
--- a/hosts/c3d2-web/default.nix
+++ b/hosts/c3d2-web/default.nix
@@ -54,13 +54,13 @@ in
           "~ ^/.well-known/matrix/server" = {
             return = "200 '{\"m.server\": \"matrix.c3d2.de:443\"}'";
             extraConfig = ''
-              add_header Content-Type application/json;
+              default_type application/json;
             '';
           };
           "~ ^/.well-known/matrix/client" = {
             return = "200 '{\"m.homeserver\": {\"base_url\": \"https://matrix.c3d2.de\"}}'";
             extraConfig = ''
-              add_header "Content-Type" application/json;
+              default_type application/json;
               add_header "Access-Control-Allow-Origin" *;
             '';
           };