diff --git a/src/Symfony/Component/Config/Resource/ReflectionClassResource.php b/src/Symfony/Component/Config/Resource/ReflectionClassResource.php
index f05042f8d3..d5e6b829cf 100644
--- a/src/Symfony/Component/Config/Resource/ReflectionClassResource.php
+++ b/src/Symfony/Component/Config/Resource/ReflectionClassResource.php
@@ -140,7 +140,7 @@ class ReflectionClassResource implements SelfCheckingResourceInterface, \Seriali
 
             foreach ($class->getProperties(\ReflectionProperty::IS_PUBLIC | \ReflectionProperty::IS_PROTECTED) as $p) {
                 yield $p->getDocComment().$p;
-                yield print_r(isset($defaults[$p->name]) ? $defaults[$p->name] : null, true);
+                yield print_r(isset($defaults[$p->name]) && !\is_object($defaults[$p->name]) ? $defaults[$p->name] : null, true);
             }
         }
 
diff --git a/src/Symfony/Component/Config/Tests/Resource/ReflectionClassResourceTest.php b/src/Symfony/Component/Config/Tests/Resource/ReflectionClassResourceTest.php
index 1f0bcb17b4..76cad1433b 100644
--- a/src/Symfony/Component/Config/Tests/Resource/ReflectionClassResourceTest.php
+++ b/src/Symfony/Component/Config/Tests/Resource/ReflectionClassResourceTest.php
@@ -170,6 +170,15 @@ EOPHP;
         $res = new ReflectionClassResource(new \ReflectionClass(TestServiceSubscriber::class));
         $this->assertTrue($res->isFresh(0));
     }
+
+    public function testIgnoresObjectsInSignature()
+    {
+        $res = new ReflectionClassResource(new \ReflectionClass(TestServiceWithStaticProperty::class));
+        $this->assertTrue($res->isFresh(0));
+
+        TestServiceWithStaticProperty::$initializedObject = new TestServiceWithStaticProperty();
+        $this->assertTrue($res->isFresh(0));
+    }
 }
 
 interface DummyInterface
@@ -195,3 +204,8 @@ class TestServiceSubscriber implements ServiceSubscriberInterface
         return self::$subscribedServices;
     }
 }
+
+class TestServiceWithStaticProperty
+{
+    public static $initializedObject;
+}