diff --git a/lib/Gedmo/Loggable/Mapping/Event/Adapter/ORM.php b/lib/Gedmo/Loggable/Mapping/Event/Adapter/ORM.php
index ec87f8d6f4..7d768da254 100644
--- a/lib/Gedmo/Loggable/Mapping/Event/Adapter/ORM.php
+++ b/lib/Gedmo/Loggable/Mapping/Event/Adapter/ORM.php
@@ -38,7 +38,7 @@ public function getNewVersion($meta, $object)
         $em = $this->getObjectManager();
         $objectMeta = $em->getClassMetadata(get_class($object));
         $identifierField = $this->getSingleIdentifierFieldName($objectMeta);
-        $objectId = $objectMeta->getReflectionProperty($identifierField)->getValue($object);
+        $objectId = (string) $objectMeta->getReflectionProperty($identifierField)->getValue($object);
 
         $dql = "SELECT MAX(log.version) FROM {$meta->name} log";
         $dql .= " WHERE log.objectId = :objectId";