diff --git a/packages/xpub-styleguide/src/webpack-config.js b/packages/xpub-styleguide/src/webpack-config.js
index 6fb01a12bb25b975f071d18a0e7cb093c8912e1c..6f9f0f79a1d605e76d8a36c8a7dd9f0d1a962c69 100644
--- a/packages/xpub-styleguide/src/webpack-config.js
+++ b/packages/xpub-styleguide/src/webpack-config.js
@@ -25,13 +25,8 @@ module.exports = dir => {
     //   whitelist: [/\.(?!js$).{1,5}$/i]
     // })],
     plugins: [
-      // mock CONFIG
+      // mock constants
       new webpack.DefinePlugin({
-        CONFIG: {
-          'pubsweet-client': {
-            API_ENDPOINT: JSON.stringify('/')
-          }
-        },
         PUBSWEET_COMPONENTS: '[]'
       }),
     ],