diff --git a/lib/Doctrine/ORM/Mapping/Driver/AnnotationDriver.php b/lib/Doctrine/ORM/Mapping/Driver/AnnotationDriver.php
index b74fc860e..22e6d4d7e 100644
--- a/lib/Doctrine/ORM/Mapping/Driver/AnnotationDriver.php
+++ b/lib/Doctrine/ORM/Mapping/Driver/AnnotationDriver.php
@@ -67,10 +67,10 @@ class AnnotationDriver implements Driver
      * Initializes a new AnnotationDriver that uses the given AnnotationReader for reading
      * docblock annotations.
      * 
-     * @param $reader The AnnotationReader to use.
+     * @param AnnotationReader $reader The AnnotationReader to use, duck-typed.
      * @param string|array $paths One or multiple paths where mapping classes can be found. 
      */
-    public function __construct(AnnotationReader $reader, $paths = null)
+    public function __construct($reader, $paths = null)
     {
         $this->_reader = $reader;
         if ($paths) {