diff --git a/tests/Fake/FakeHavingCompileInjector.php b/tests/Fake/FakeHavingCompileInjector.php
index 1221cabb..429300ce 100644
--- a/tests/Fake/FakeHavingCompileInjector.php
+++ b/tests/Fake/FakeHavingCompileInjector.php
@@ -7,7 +7,8 @@
 
 final class FakeHavingCompileInjector
 {
-    public InjectorInterface $injector;
+    /** @var InjectorInterface */
+    public $injector;
 
     public function __serialize()
     {