diff --git a/src/Handshake/ServerNegotiator.php b/src/Handshake/ServerNegotiator.php
index d1b405b..2a6b2cd 100644
--- a/src/Handshake/ServerNegotiator.php
+++ b/src/Handshake/ServerNegotiator.php
@@ -22,12 +22,12 @@ class ServerNegotiator implements NegotiatorInterface {
 
     public function __construct(
         RequestVerifier $requestVerifier,
-        // ResponseFactoryInterface $responseFactory,
+        ResponseFactoryInterface $responseFactory,
         $enablePerMessageDeflate = null
     ) {
         if ($enablePerMessageDeflate == null) $enablePerMessageDeflate = false;
         $this->verifier = $requestVerifier;
-        // $this->responseFactory = $responseFactory;
+        $this->responseFactory = $responseFactory;
 
         // https://bugs.php.net/bug.php?id=73373
         // https://bugs.php.net/bug.php?id=74240 - need >=7.1.4 or >=7.0.18