diff --git a/src/Facebook/GraphNodes/GraphNode.php b/src/Facebook/GraphNodes/GraphNode.php
index 061e74494..a81c47b7b 100644
--- a/src/Facebook/GraphNodes/GraphNode.php
+++ b/src/Facebook/GraphNodes/GraphNode.php
@@ -150,7 +150,8 @@ public function shouldCastAsDateTime($key)
             'backdated_time',
             'issued_at',
             'expires_at',
-            'publish_time'
+            'publish_time',
+            'joined'
         ], true);
     }