diff --git a/lib/Doctrine/ORM/Internal/Hydration/AbstractHydrator.php b/lib/Doctrine/ORM/Internal/Hydration/AbstractHydrator.php
index 95cffa125..f430cb912 100644
--- a/lib/Doctrine/ORM/Internal/Hydration/AbstractHydrator.php
+++ b/lib/Doctrine/ORM/Internal/Hydration/AbstractHydrator.php
@@ -297,7 +297,7 @@ abstract class AbstractHydrator
                     if(
                         isset($cacheKeyInfo['discriminatorColumn']) && 
                         isset($data[$cacheKeyInfo['discriminatorColumn']]) &&
-                        $data[$cacheKeyInfo['discriminatorColumn']] !== $cacheKeyInfo['discriminatorValue']
+                        $data[$cacheKeyInfo['discriminatorColumn']] != $cacheKeyInfo['discriminatorValue']
                     ){
                         break;
                     }