diff --git a/lib/Doctrine/ORM/Id/AbstractIdGenerator.php b/lib/Doctrine/ORM/Id/AbstractIdGenerator.php
index 5ed2872ad..dada71e43 100644
--- a/lib/Doctrine/ORM/Id/AbstractIdGenerator.php
+++ b/lib/Doctrine/ORM/Id/AbstractIdGenerator.php
@@ -26,7 +26,7 @@ abstract class AbstractIdGenerator
     /**
      * Generates an identifier for an entity.
      *
-     * @param EntityManager|EntityManager $em
+     * @param EntityManager $em
      * @param \Doctrine\ORM\Mapping\Entity $entity
      * @return mixed
      */