diff --git a/default.nix b/default.nix
index 96ce18c..03699a4 100644
--- a/default.nix
+++ b/default.nix
@@ -48,6 +48,7 @@ let
     name,
     src,
     nodePackages ? null,
+    routes ? [ "/" ],
   }:
     let
       nodeSource = symlinkJoin {
@@ -56,6 +57,12 @@ let
           builderPkg.lib
         ] ++ (if nodePackages != null then [ nodePackages ] else [ ]);
       };
+
+      baseWebpackConfig = builtins.readFile ./webpack.config.js;
+      webpackConfig = ''
+        const ROUTES = ${builtins.toJSON routes}
+      '' + "\n" + baseWebpackConfig;
+      webpackConfigFile = pkgs.writeText "${name}-webpack-config" webpackConfig;
     in
     stdenv.mkDerivation {
       inherit name;
@@ -70,7 +77,7 @@ let
 
       patchPhase = ''
         ln -sf ${nodeSource}/node_modules .
-        cp ${./webpack.config.js} webpack.config.js
+        cp ${webpackConfigFile} webpack.config.js
       '';
 
       shellHook = ''
diff --git a/webpack.config.js b/webpack.config.js
index 097a966..c973e2b 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -1,5 +1,3 @@
-const ROUTES = ['/', '/about', '/404', '/posts', '/posts/viveahk', '/posts/librebasics']
-
 const path = require('path')
 const HtmlWebpackPlugin = require('html-webpack-plugin')
 const PrerenderSPAPlugin = require('prerender-spa-plugin')