diff --git a/default.nix b/default.nix
index 70daf345..b951e7d3 100644
--- a/default.nix
+++ b/default.nix
@@ -1,5 +1,5 @@
 {
-  pkgs ? import ./nix/nixpkgs.nix { enableMozillaOverlay = false; },
+  pkgs ? import ./nix/nixpkgs.nix { },
   src ? builtins.fetchGit {
     url = ./.;
     ref = "HEAD";
diff --git a/example/shell.nix b/example/shell.nix
index 3b60b8e1..aee3eef6 100644
--- a/example/shell.nix
+++ b/example/shell.nix
@@ -1,4 +1,4 @@
-with import ../nix/nixpkgs.nix { enableMozillaOverlay = false; };
+with import ../nix/nixpkgs.nix { };
 
 mkShell {
   buildInputs = [
diff --git a/nix/nixpkgs.nix b/nix/nixpkgs.nix
index 4b6cb61d..22535a06 100644
--- a/nix/nixpkgs.nix
+++ b/nix/nixpkgs.nix
@@ -1,4 +1,4 @@
-{ enableMozillaOverlay }:
+{ enableMozillaOverlay ? false }:
 let
   hostpkgs = import <nixpkgs> {};