diff --git a/tests/_bootstrap.php b/tests/_bootstrap.php
index fed1e7c9..50ca9a49 100644
--- a/tests/_bootstrap.php
+++ b/tests/_bootstrap.php
@@ -3,14 +3,14 @@
 use Pimcore\Tests\Support\Util\Autoloader;
 
 
-if (file_exists(__DIR__ . '/../vendor/autoload.php')) {
-    include __DIR__ . '/../vendor/autoload.php';
+if (file_exists(__DIR__ . '/../vendor/autoload_runtime.php')) {
+    include __DIR__ . '/../vendor/autoload_runtime.php';
     $pimcoreTestDir = __DIR__ . '/../vendor/pimcore/pimcore/tests';
-} elseif (file_exists(__DIR__ . '/../../../../vendor/autoload.php')) {
-    include __DIR__ . '/../../../../vendor/autoload.php';
+} elseif (file_exists(__DIR__ . '/../../../../vendor/autoload_runtime.php')) {
+    include __DIR__ . '/../../../../vendor/autoload_runtime.php';
     $pimcoreTestDir = __DIR__ . '/../../../../vendor/pimcore/pimcore/tests';
-} elseif (getenv('PIMCORE_PROJECT_ROOT') != '' && file_exists(getenv('PIMCORE_PROJECT_ROOT') . '/vendor/autoload.php')) {
-    include getenv('PIMCORE_PROJECT_ROOT') . '/vendor/autoload.php';
+} elseif (getenv('PIMCORE_PROJECT_ROOT') != '' && file_exists(getenv('PIMCORE_PROJECT_ROOT') . '/vendor/autoload_runtime.php')) {
+    include getenv('PIMCORE_PROJECT_ROOT') . '/vendor/autoload_runtime.php';
     $pimcoreTestDir = getenv('PIMCORE_PROJECT_ROOT') . '/vendor/pimcore/pimcore/tests';
 } elseif (getenv('PIMCORE_PROJECT_ROOT') != '') {
     throw new \Exception('Invalid Pimcore project root "' . getenv('PIMCORE_PROJECT_ROOT') . '"');