diff --git a/src/Monolog/Handler/MandrillHandler.php b/src/Monolog/Handler/MandrillHandler.php
index 6525a01d..60a2901e 100644
--- a/src/Monolog/Handler/MandrillHandler.php
+++ b/src/Monolog/Handler/MandrillHandler.php
@@ -56,6 +56,7 @@ class MandrillHandler extends MailHandler
 
         curl_setopt($ch, CURLOPT_URL, 'https://mandrillapp.com/api/1.0/messages/send-raw.json');
         curl_setopt($ch, CURLOPT_POST, 1);
+        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
         curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query(array(
             'key' => $this->apiKey,
             'raw_message' => (string) $message,