diff --git a/default.nix b/default.nix
index 0562699..2675e4f 100644
--- a/default.nix
+++ b/default.nix
@@ -1,6 +1,8 @@
 # Licensed under GNU Lesser General Public License v3 or later, see COPYING.
 # Copyright (c) 2019 Alexander Sosedkin and other contributors, see AUTHORS.
 
+{ }:
+
 let
   nixpkgs = import <nixpkgs> { };