diff --git a/src/Ratchet/App.php b/src/Ratchet/App.php
index 5cb4ae7..0b151b0 100644
--- a/src/Ratchet/App.php
+++ b/src/Ratchet/App.php
@@ -56,7 +56,7 @@ class App {
      */
     public function __construct($httpHost = 'localhost', $port = 8080, $address = '127.0.0.1', LoopInterface $loop = null) {
         if (extension_loaded('xdebug')) {
-            echo "XDebug extension detected. Remember to disable this if performance testing or going live!\n";
+            trigger_error("XDebug extension detected. Remember to disable this if performance testing or going live!", E_USER_WARNING);
         }
 
         if (null === $loop) {