diff --git a/lib/Dispatcher.php b/lib/Dispatcher.php
index 5f045df..48165a2 100644
--- a/lib/Dispatcher.php
+++ b/lib/Dispatcher.php
@@ -40,6 +40,11 @@ class Dispatcher
      */
     private $contextFactory;
 
+    /**
+     * @var \JsonMapper
+     */
+    private $mapper;
+
     /**
      * @param object $target    The target object that should receive the method calls
      * @param string $delimiter A delimiter for method calls on properties, for example someProperty->someMethod