diff --git a/docs/next.config.js b/docs/next.config.js
index 7510410..b455ee2 100644
--- a/docs/next.config.js
+++ b/docs/next.config.js
@@ -2,6 +2,11 @@ const withMDX = require('@next/mdx')({
   extension: /\.mdx?$/,
   options: { format: 'mdx' },
 })
+
+const isDev =
+  process.env.VERCEL_ENV === 'preview' || process.env.NODE_ENV === 'development'
+
 module.exports = withMDX({
   pageExtensions: ['js', 'jsx', 'tsx', 'md', 'mdx'],
+  assetPrefix: isDev ? '' : 'https://charts.docs.carbonplan.org',
 })