diff --git a/tests/bootstrap.php b/tests/bootstrap.php
index 388c0e9..37f15b1 100644
--- a/tests/bootstrap.php
+++ b/tests/bootstrap.php
@@ -11,6 +11,8 @@
 
 require __DIR__ . '/app/TestKernel.php';
 
-AnnotationRegistry::registerLoader([$loader, 'loadClass']);
+if (\class_exists(AnnotationRegistry::class)) {
+    AnnotationRegistry::registerLoader([$loader, 'loadClass']);
+}
 
 return $loader;