diff --git a/src/Symfony/Bundle/FrameworkBundle/CacheWarmer/ValidatorCacheWarmer.php b/src/Symfony/Bundle/FrameworkBundle/CacheWarmer/ValidatorCacheWarmer.php
index ce5104dc41cc5..d450cc1f85237 100644
--- a/src/Symfony/Bundle/FrameworkBundle/CacheWarmer/ValidatorCacheWarmer.php
+++ b/src/Symfony/Bundle/FrameworkBundle/CacheWarmer/ValidatorCacheWarmer.php
@@ -66,12 +66,23 @@ public function warmUp($cacheDir)
         $loaders = $this->validatorBuilder->getLoaders();
         $metadataFactory = new LazyLoadingMetadataFactory(new LoaderChain($loaders), new Psr6Cache($arrayPool));
 
-        foreach ($this->extractSupportedLoaders($loaders) as $loader) {
-            foreach ($loader->getMappedClasses() as $mappedClass) {
-                if ($metadataFactory->hasMetadataFor($mappedClass)) {
-                    $metadataFactory->getMetadataFor($mappedClass);
+        $throwingAutoloader = function ($class) { throw new \ReflectionException(sprintf('Class %s does not exist', $class)); };
+        spl_autoload_register($throwingAutoloader);
+
+        try {
+            foreach ($this->extractSupportedLoaders($loaders) as $loader) {
+                foreach ($loader->getMappedClasses() as $mappedClass) {
+                    try {
+                        if ($metadataFactory->hasMetadataFor($mappedClass)) {
+                            $metadataFactory->getMetadataFor($mappedClass);
+                        }
+                    } catch (\ReflectionException $e) {
+                        // ignore failing reflection
+                    }
                 }
             }
+        } finally {
+            spl_autoload_unregister($throwingAutoloader);
         }
 
         $values = $arrayPool->getValues();
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Fixtures/Validation/Article.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Fixtures/Validation/Article.php
new file mode 100644
index 0000000000000..a1ecee6d0b375
--- /dev/null
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Fixtures/Validation/Article.php
@@ -0,0 +1,8 @@
+<?php
+
+namespace Symfony\Bundle\FrameworkBundle\Tests\Fixtures\Validation;
+
+class Article implements NotExistingInterface
+{
+    public $category;
+}
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Fixtures/Validation/Resources/person.xml b/src/Symfony/Bundle/FrameworkBundle/Tests/Fixtures/Validation/Resources/person.xml
index b23760ae4556c..f58be2dc6c0b4 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Fixtures/Validation/Resources/person.xml
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Fixtures/Validation/Resources/person.xml
@@ -16,8 +16,8 @@
         </property>
     </class>
 
-    <class name="Symfony\Bundle\FrameworkBundle\Tests\Fixtures\Validation\NonExistentClass">
-        <property name="gender">
+    <class name="Symfony\Bundle\FrameworkBundle\Tests\Fixtures\Validation\Article">
+        <property name="category">
             <constraint name="Choice">
                 <option name="choices">
                     <value>other</value>