diff --git a/plugins/libkolab/lib/kolab_storage_dataset.php b/plugins/libkolab/lib/kolab_storage_dataset.php
index d23ba690..23dfb868 100644
--- a/plugins/libkolab/lib/kolab_storage_dataset.php
+++ b/plugins/libkolab/lib/kolab_storage_dataset.php
@@ -31,7 +31,7 @@ class kolab_storage_dataset implements Iterator, ArrayAccess, Countable
     private $buffer = false;
     private $index = array();
     private $data = array();
-    private $iteratorkey = -1;
+    private $iteratorkey = 0;
 
     /**
      * Default constructor