diff --git a/lib/BaseSendGridClientInterface.php b/lib/BaseSendGridClientInterface.php
index 3326a9da..2806e544 100644
--- a/lib/BaseSendGridClientInterface.php
+++ b/lib/BaseSendGridClientInterface.php
@@ -66,7 +66,7 @@ public function __construct($auth, $host, $options = array())
      */
     public function send(Mail $email)
     {
-        return $this->client->mail()->send()->post($email);
+        return $this->client->mail()->send()->post($email->jsonSerialize());
     }
 
     /*