diff --git a/lib/Doctrine/ORM/UnitOfWork.php b/lib/Doctrine/ORM/UnitOfWork.php
index 349be6dcb..4f8ce32db 100644
--- a/lib/Doctrine/ORM/UnitOfWork.php
+++ b/lib/Doctrine/ORM/UnitOfWork.php
@@ -3124,7 +3124,7 @@ class UnitOfWork implements PropertyChangedListener
      */
     public function clearEntityChangeSet($oid)
     {
-        $this->entityChangeSets[$oid] = [];
+        unset($this->entityChangeSets[$oid]);
     }
 
     /* PropertyChangedListener implementation */