diff --git a/src/Symfony/Component/HttpKernel/Tests/KernelTest.php b/src/Symfony/Component/HttpKernel/Tests/KernelTest.php
index 628be627fd4b..7cde2ac5e2ef 100644
--- a/src/Symfony/Component/HttpKernel/Tests/KernelTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/KernelTest.php
@@ -911,7 +911,7 @@ public function testKernelStartTimeIsResetWhileBootingAlreadyBootedKernel()
         $preReBoot = $kernel->getStartTime();
 
         sleep(3600); //Intentionally large value to detect if ClockMock ever breaks
-        $kernel->boot();
+        $kernel->reboot(null);
 
         $this->assertGreaterThan($preReBoot, $kernel->getStartTime());
     }