diff --git a/lib/AutodiscoverJson.php b/lib/AutodiscoverJson.php
--- a/lib/AutodiscoverJson.php
+++ b/lib/AutodiscoverJson.php
@@ -56,7 +56,7 @@
         }
         elseif (strtolower($_GET['Protocol']) == 'autodiscoverv1') {
             $json = array(
-                'Protocol' => 'ActiveSync',
+                'Protocol' => 'AutoDiscoverV1',
                 'Url' => 'https://' . $_SERVER['HTTP_HOST'] . '/Autodiscover/Autodiscover.xml'
             );
         }