diff --git a/lib/Doctrine/ORM/Tools/ResolveDiscriminatorMapListener.php b/lib/Doctrine/ORM/Tools/ResolveDiscriminatorMapListener.php
index c4dcfe7ee..9b86a4604 100644
--- a/lib/Doctrine/ORM/Tools/ResolveDiscriminatorMapListener.php
+++ b/lib/Doctrine/ORM/Tools/ResolveDiscriminatorMapListener.php
@@ -42,9 +42,8 @@ class ResolveDiscriminatorMapListener
      *
      * @param string $originalEntity
      * @param string $newEntity
-     * @param array  $mapping
      */
-    public function __construct($originalEntity, $newEntity, array $mapping)
+    public function __construct($originalEntity, $newEntity)
     {
         $this->resolveTargetEntities[ltrim($originalEntity, "\\")] = ltrim($newEntity, "\\");
     }