diff --git a/pkgs/http_multi_server/lib/http_multi_server.dart b/pkgs/http_multi_server/lib/http_multi_server.dart
index c055367..76c3eba 100644
--- a/pkgs/http_multi_server/lib/http_multi_server.dart
+++ b/pkgs/http_multi_server/lib/http_multi_server.dart
@@ -27,6 +27,9 @@
     }
   }
 
+  HttpHeaders get defaultResponseHeaders =>
+      throw new UnsupportedError('defaultResponseHeaders not supported');
+
   Duration get idleTimeout => _servers.first.idleTimeout;
   set idleTimeout(Duration value) {
     for (var server in _servers) {