diff --git a/default.nix b/default.nix
index dc10c6f..96ce18c 100644
--- a/default.nix
+++ b/default.nix
@@ -70,6 +70,7 @@ let
 
       patchPhase = ''
         ln -sf ${nodeSource}/node_modules .
+        cp ${./webpack.config.js} webpack.config.js
       '';
 
       shellHook = ''