diff --git a/default.nix b/default.nix
index 4830bb9..24cedb3 100644
--- a/default.nix
+++ b/default.nix
@@ -1,7 +1,6 @@
 # default.nix
 let
-  nixpkgs = fetchTarball "https://github.com/NixOS/nixpkgs/archive/master.tar.gz";
-  pkgs = import nixpkgs { config = {}; overlays = []; };
+  pkgs = import <nixpkgs> { config = {}; overlays = []; };
 in
 {
   xbuild = pkgs.callPackage ./pkgs/x/xbuild/package.nix {};