diff --git a/vivado.nix b/vivado.nix
index 6309252..ec31ba5 100644
--- a/vivado.nix
+++ b/vivado.nix
@@ -1,7 +1,7 @@
 # Install Vivado in /opt and add to /etc/nixos/configuration.nix:
 #  nix.sandboxPaths = ["/opt"];
 
-{ pkgs ? import <nixpkgs> {}}:
+{ pkgs }:
 let
   vivadoEnv = pkgs.buildFHSUserEnv {
     name = "vivado-env";