diff --git a/flake.nix b/flake.nix
index d5cc3dc..99447ce 100644
--- a/flake.nix
+++ b/flake.nix
@@ -9,7 +9,9 @@
   };
 
   outputs = { self, nixpkgs, npm-buildpackage, flake-utils, ... }: flake-utils.lib.eachDefaultSystem (system: let
-    pkgs = import nixpkgs { inherit system; overlays = [ npm-buildpackage.overlay ]; };
+    pkgs = import nixpkgs { inherit system; overlays = [(final: prev: {
+      inherit (final.callPackage "${npm-buildpackage}" { nodejs = final.nodejs-14_x; }) mkNodeModules buildNpmPackage buildYarnPackage;
+    })]; };
   in {
     packages.mudl = pkgs.buildNpmPackage {
       src = ./.;