diff --git a/src/Symfony/Component/HttpKernel/Kernel.php b/src/Symfony/Component/HttpKernel/Kernel.php
index 402e039144..cc726999eb 100644
--- a/src/Symfony/Component/HttpKernel/Kernel.php
+++ b/src/Symfony/Component/HttpKernel/Kernel.php
@@ -83,12 +83,13 @@ abstract class Kernel implements KernelInterface, RebootableInterface, Terminabl
     const END_OF_MAINTENANCE = '07/2019';
     const END_OF_LIFE = '01/2020';
 
-    public function __construct(string $environment, bool $debug)
+    public function __construct(string $environment, bool $debug, string $projectDir = null)
     {
         $this->environment = $environment;
         $this->debug = $debug;
         $this->rootDir = $this->getRootDir(false);
         $this->name = $this->getName(false);
+        $this->projectDir = $projectDir;
     }
 
     public function __clone()