diff --git a/src/Composer/EventDispatcher/EventDispatcher.php b/src/Composer/EventDispatcher/EventDispatcher.php
index c5033124e..dff5456e1 100644
--- a/src/Composer/EventDispatcher/EventDispatcher.php
+++ b/src/Composer/EventDispatcher/EventDispatcher.php
@@ -44,6 +44,7 @@ class EventDispatcher
     protected $io;
     protected $loader;
     protected $process;
+    protected $listeners;
 
     /**
      * Constructor.