diff --git a/src/Symfony/Component/Serializer/Mapping/Loader/XmlFileLoader.php b/src/Symfony/Component/Serializer/Mapping/Loader/XmlFileLoader.php
index d023402f74ade..5ef21fb370683 100644
--- a/src/Symfony/Component/Serializer/Mapping/Loader/XmlFileLoader.php
+++ b/src/Symfony/Component/Serializer/Mapping/Loader/XmlFileLoader.php
@@ -72,7 +72,7 @@ public function loadClassMetadata(ClassMetadataInterface $classMetadata)
                 }
 
                 if (isset($attribute['ignore'])) {
-                    $attributeMetadata->setIgnore((bool) $attribute['ignore']);
+                    $attributeMetadata->setIgnore(XmlUtils::phpize($attribute['ignore']));
                 }
 
                 foreach ($attribute->context as $node) {
diff --git a/src/Symfony/Component/Serializer/Tests/Fixtures/serialization.xml b/src/Symfony/Component/Serializer/Tests/Fixtures/serialization.xml
index da61e0acce8dc..69243cfddb5ae 100644
--- a/src/Symfony/Component/Serializer/Tests/Fixtures/serialization.xml
+++ b/src/Symfony/Component/Serializer/Tests/Fixtures/serialization.xml
@@ -37,6 +37,7 @@
     <class name="Symfony\Component\Serializer\Tests\Fixtures\Annotations\IgnoreDummy">
         <attribute name="ignored1" ignore="true" />
         <attribute name="ignored2" ignore="true" />
+        <attribute name="notIgnored" ignore="false" />
     </class>
 
     <class name="Symfony\Component\Serializer\Tests\Fixtures\Annotations\ContextDummyParent">
diff --git a/src/Symfony/Component/Serializer/Tests/Mapping/Loader/XmlFileLoaderTest.php b/src/Symfony/Component/Serializer/Tests/Mapping/Loader/XmlFileLoaderTest.php
index 201cb68ba8ff8..47d6305a898f2 100644
--- a/src/Symfony/Component/Serializer/Tests/Mapping/Loader/XmlFileLoaderTest.php
+++ b/src/Symfony/Component/Serializer/Tests/Mapping/Loader/XmlFileLoaderTest.php
@@ -107,6 +107,7 @@ public function testLoadIgnore()
         $attributesMetadata = $classMetadata->getAttributesMetadata();
         $this->assertTrue($attributesMetadata['ignored1']->isIgnored());
         $this->assertTrue($attributesMetadata['ignored2']->isIgnored());
+        $this->assertFalse($attributesMetadata['notIgnored']->isIgnored());
     }
 
     protected function getLoaderForContextMapping(): LoaderInterface