diff --git a/default.nix b/default.nix
index ed79724..10e5684 100644
--- a/default.nix
+++ b/default.nix
@@ -171,7 +171,9 @@ let
 
       shellHook = ''
         ln -sf ${nodeSource}/node_modules .
-        ln -sf ${webpackConfigFile} webpack.config.js
+        rm webpack.config.js
+        cp ${webpackConfigFile} webpack.config.js
+        export NODE_PATH=$PWD/node_modules
       '';
 
       buildPhase = elmPackages.fetchElmDeps {