diff --git a/lib/Doctrine/ORM/Query/AST/Functions/IdentityFunction.php b/lib/Doctrine/ORM/Query/AST/Functions/IdentityFunction.php
index 540f2df9d..7e1d75aee 100644
--- a/lib/Doctrine/ORM/Query/AST/Functions/IdentityFunction.php
+++ b/lib/Doctrine/ORM/Query/AST/Functions/IdentityFunction.php
@@ -41,7 +41,7 @@ class IdentityFunction extends FunctionNode
     public $pathExpression;
 
     /**
-     * @var integer
+     * @var string
      */
     public $fieldMapping;