diff --git a/module/Rest/test/Middleware/CheckAuthenticationMiddlewareTest.php b/module/Rest/test/Middleware/CheckAuthenticationMiddlewareTest.php
index 5fd78a7b..9c805d1b 100644
--- a/module/Rest/test/Middleware/CheckAuthenticationMiddlewareTest.php
+++ b/module/Rest/test/Middleware/CheckAuthenticationMiddlewareTest.php
@@ -30,6 +30,11 @@ class CheckAuthenticationMiddlewareTest extends TestCase
      */
     protected $jwtService;
 
+    /**
+     * @var callable
+     */
+    protected $dummyMiddleware;
+
     public function setUp()
     {
         $this->jwtService = $this->prophesize(JWTService::class);