diff --git a/lib/server.js b/lib/server.js
index 8f60db7d..7b91846d 100644
--- a/lib/server.js
+++ b/lib/server.js
@@ -157,6 +157,7 @@ module.exports = async (req, res, flags, current, ignoredFiles) => {
 
   const contentType = mime.contentType(path.extname(related)) || mime.contentType('text')
   res.setHeader('Content-Type', contentType)
+  res.setHeader('X-Powered-By', 'https://github.com/zeit/serve')
 
   if (binaryStat) {
     res.statusCode = statusCode