diff --git a/default.nix b/default.nix
index b9c60cf2a52cf5aaf517d029431cc1d95888d196..774fddb242d0c17666d23c89095a9c99c3c168eb 100644
--- a/default.nix
+++ b/default.nix
@@ -1,5 +1,5 @@
-with import <nixpkgs> {};
-
+{ pkgs ? import <nixpkgs> {} }:
+with pkgs;
 let texlive = pkgs.texlive.combine {
     inherit (pkgs.texlive)
     everypage