diff --git a/src/Routing/Hook/HeadHook.php b/src/Routing/Hook/HeadHook.php
index d89bfd9..6cd4341 100644
--- a/src/Routing/Hook/HeadHook.php
+++ b/src/Routing/Hook/HeadHook.php
@@ -12,7 +12,7 @@ use WellRESTed\Routing\MiddlewareInterface;
  */
 class HeadHook implements MiddlewareInterface
 {
-    public function dispatch(ServerRequestInterface $request, ResponseInterface &$response)
+    public function dispatch(ServerRequestInterface $request, ResponseInterface $response, $next)
     {
         $method = strtoupper($request->getMethod());
         if ($method === "HEAD") {
@@ -20,5 +20,6 @@ class HeadHook implements MiddlewareInterface
                 $response = $response->withBody(new NullStream());
             }
         }
+        return $next($request, $response);
     }
 }
diff --git a/test/tests/unit/Routing/Hook/HeadHookTest.php b/test/tests/unit/Routing/Hook/HeadHookTest.php
index 6506f74..c80e04a 100644
--- a/test/tests/unit/Routing/Hook/HeadHookTest.php
+++ b/test/tests/unit/Routing/Hook/HeadHookTest.php
@@ -13,6 +13,7 @@ class HeadHookTest extends \PHPUnit_Framework_TestCase
 {
     private $request;
     private $response;
+    private $next;
     private $body;
 
     public function setUp()
@@ -27,36 +28,33 @@ class HeadHookTest extends \PHPUnit_Framework_TestCase
             $this->getBody()->willReturn($args[0]);
             return $this;
         });
+        $this->next = function ($request, $response) {
+            return $response;
+        };
     }
 
     public function testReplacesBodyForHeadRequest()
     {
         $this->request->getMethod()->willReturn("HEAD");
-        $request = $this->request->reveal();
-        $response = $this->response->reveal();
         $hook = new HeadHook();
-        $hook->dispatch($request, $response);
+        $response = $hook->dispatch($this->request->reveal(), $this->response->reveal(), $this->next);
         $this->assertSame(0, $response->getBody()->getSize());
     }
 
     public function testMultipleDispatchesHaveNoEffect()
     {
         $this->request->getMethod()->willReturn("HEAD");
-        $request = $this->request->reveal();
-        $response = $this->response->reveal();
         $hook = new HeadHook();
-        $hook->dispatch($request, $response);
-        $hook->dispatch($request, $response);
+        $response = $hook->dispatch($this->request->reveal(), $this->response->reveal(), $this->next);
+        $hook->dispatch($this->request->reveal(), $response, $this->next);
         $this->response->withBody(Argument::any())->shouldHaveBeenCalledTimes(1);
     }
 
     public function testDoesNotReplaceBodyForNonHeadRequests()
     {
         $this->request->getMethod()->willReturn("GET");
-        $request = $this->request->reveal();
-        $response = $this->response->reveal();
         $hook = new HeadHook();
-        $hook->dispatch($request, $response);
+        $hook->dispatch($this->request->reveal(), $this->response->reveal(), $this->next);
         $this->response->withBody(Argument::any())->shouldNotHaveBeenCalled();
     }
 }