diff --git a/typo3/install/index.php b/typo3/install/index.php
index 25b996a526e7f07aaaa49cc333d863f6b0078773..d1dee35ebd647c0759297d616baae8ac844dbe1d 100644
--- a/typo3/install/index.php
+++ b/typo3/install/index.php
@@ -13,11 +13,13 @@ call_user_func(function () {
     // This way we do not need to copy all the code here to cope with correct location header URL generation correctly
     // as those two classes can already correctly deal with all known edge cases.
 
-    require __DIR__ . '/../../vendor/autoload.php';
+    $classLoader = require __DIR__ . '/../../vendor/autoload.php';
 
     // We ensure that possible notices from Core code do not kill our redirect due to PHP output
     error_reporting(E_ALL & ~(E_STRICT | E_NOTICE | E_DEPRECATED));
 
     // @deprecated in 9.x will be removed in 10.0
+    \TYPO3\CMS\Core\Core\SystemEnvironmentBuilder::run(2, \TYPO3\CMS\Core\Core\SystemEnvironmentBuilder::REQUESTTYPE_INSTALL);
+    \TYPO3\CMS\Core\Core\Bootstrap::init($classLoader, true);
     \TYPO3\CMS\Core\Utility\HttpUtility::redirect('../install.php', \TYPO3\CMS\Core\Utility\HttpUtility::HTTP_STATUS_307);
 });