diff --git a/lib/Doctrine/ORM/Mapping/ClassMetadataInfo.php b/lib/Doctrine/ORM/Mapping/ClassMetadataInfo.php
index 1216fcfb8..0f7919ea9 100644
--- a/lib/Doctrine/ORM/Mapping/ClassMetadataInfo.php
+++ b/lib/Doctrine/ORM/Mapping/ClassMetadataInfo.php
@@ -908,9 +908,8 @@ class ClassMetadataInfo implements ClassMetadata
     public function newInstance()
     {
         if ($this->_prototype === null) {
-            if (PHP_VERSION_ID >= 50400) {
-                $rc               = new \ReflectionClass($this->name);
-                $this->_prototype = $rc->newInstanceWithoutConstructor();
+            if (PHP_VERSION_ID === 50428 || PHP_VERSION_ID === 50513) {
+                $this->_prototype = $this->reflClass->newInstanceWithoutConstructor();
             } else {
                 $this->_prototype = unserialize(sprintf('O:%d:"%s":0:{}', strlen($this->name), $this->name));
             }