diff --git a/src/StreamingServer.php b/src/StreamingServer.php
index 723c508a..f2e78ab4 100644
--- a/src/StreamingServer.php
+++ b/src/StreamingServer.php
@@ -82,7 +82,7 @@
  * @see Response
  * @see self::listen()
  */
-class StreamingServer extends EventEmitter
+final class StreamingServer extends EventEmitter
 {
     private $callback;