diff --git a/src/Symfony/Contracts/Tests/Service/LegacyTestService.php b/src/Symfony/Contracts/Tests/Service/LegacyTestService.php
index 9d55b9edcc500..0e781a41a9efc 100644
--- a/src/Symfony/Contracts/Tests/Service/LegacyTestService.php
+++ b/src/Symfony/Contracts/Tests/Service/LegacyTestService.php
@@ -33,6 +33,8 @@ class LegacyTestService extends LegacyParentTestService implements ServiceSubscr
 {
     use ServiceSubscriberTrait;
 
+    protected $container;
+
     #[SubscribedService]
     public function aService(): Service2
     {
diff --git a/src/Symfony/Contracts/Tests/Service/ServiceSubscriberTraitTest.php b/src/Symfony/Contracts/Tests/Service/ServiceSubscriberTraitTest.php
index 184d92d9c4807..0d714a94a305c 100644
--- a/src/Symfony/Contracts/Tests/Service/ServiceSubscriberTraitTest.php
+++ b/src/Symfony/Contracts/Tests/Service/ServiceSubscriberTraitTest.php
@@ -56,6 +56,8 @@ public function testParentNotCalledIfHasMagicCall()
         };
         $service = new class() extends ParentWithMagicCall {
             use ServiceSubscriberTrait;
+
+            private $container;
         };
 
         $this->assertNull($service->setContainer($container));
@@ -69,6 +71,8 @@ public function testParentNotCalledIfNoParent()
         };
         $service = new class() {
             use ServiceSubscriberTrait;
+
+            private $container;
         };
 
         $this->assertNull($service->setContainer($container));