diff --git a/src/CoreBundle/Form/DataTransformer/ResourceToIdentifierTransformer.php b/src/CoreBundle/Form/DataTransformer/ResourceToIdentifierTransformer.php
index 4e421ad7ca..856029c22c 100644
--- a/src/CoreBundle/Form/DataTransformer/ResourceToIdentifierTransformer.php
+++ b/src/CoreBundle/Form/DataTransformer/ResourceToIdentifierTransformer.php
@@ -30,7 +30,7 @@ final class ResourceToIdentifierTransformer implements DataTransformerInterface
             return null;
         }
 
-        \assert(get_class($value) === $this->repository->getClassName());
+        \assert($value::class === $this->repository->getClassName());
 
         return PropertyAccess::createPropertyAccessor()->getValue($value, $this->identifier);
     }