diff --git a/swarmlab-app/src/run/app.js b/swarmlab-app/src/run/app.js
index 609efa29..a1dc69ef 100644
--- a/swarmlab-app/src/run/app.js
+++ b/swarmlab-app/src/run/app.js
@@ -843,5 +843,5 @@ var setkey = function setkv(key, value) {
   });
 };
 
-http.listen(3000, () => console.error("listening on http://localhost:3000/"));
+http.listen(PORT, () => console.error("listening on http://localhost:3000/"));
 console.error("socket.io example");