diff --git a/src/SlmMail/Service/SendGridService.php b/src/SlmMail/Service/SendGridService.php
index 00911c7..d6063cf 100644
--- a/src/SlmMail/Service/SendGridService.php
+++ b/src/SlmMail/Service/SendGridService.php
@@ -135,7 +135,7 @@ public function send(Message $message)
         $post        = $client->getRequest()->getPost();
         $attachments = $this->extractAttachments($message);
         foreach ($attachments as $attachment) {
-            $post->set('files[' . $attachment->filename . ']', $attachment->getRawContent() . ';type=' . $attachment->type);
+            $post->set('files[' . $attachment->filename . ']', $attachment->getRawContent());
         }
 
         $response = $client->setMethod(HttpRequest::METHOD_POST)