diff --git a/tutorials/http/http-restful-server/main.c b/tutorials/http/http-restful-server/main.c
index d32f571f..28c2548e 100644
--- a/tutorials/http/http-restful-server/main.c
+++ b/tutorials/http/http-restful-server/main.c
@@ -82,7 +82,9 @@ static void fn(struct mg_connection *c, int ev, void *ev_data) {
       mg_http_reply(c, 200, "", "{\"result\": \"%.*s\"}\n", hm->uri.len,
                     hm->uri.buf);
     } else {
-      struct mg_http_serve_opts opts = {.root_dir = s_root_dir};
+      struct mg_http_serve_opts opts;
+      memset(&opts, 0, sizeof(opts));
+      opts.root_dir = s_root_dir;
       mg_http_serve_dir(c, ev_data, &opts);
     }
   }