diff --git a/packages/cli/lib/build.js b/packages/cli/lib/build.js
index e15e67c..fd894c8 100644
--- a/packages/cli/lib/build.js
+++ b/packages/cli/lib/build.js
@@ -149,7 +149,7 @@ module.exports = function (src, opts) {
 				log.warn(msg);
 			}
 
-			let fn, onNoMatch = (req, res) => fn(Object.assign(req, { path:'/' }), res, r => (r.statusCode=404,r.end()));
+			let fn, onNoMatch = (req, res) => fn(Object.assign(req, { path:'/' }), res, () => (res.statusCode=404,res.end()));
 			let server = createServer(fn=sirv(dest, { onNoMatch })).listen();
 
 			// Disable sandboxing (on command) for dead-simple CI/CD/Docker integrations