diff --git a/src/Symfony/Component/Mime/Email.php b/src/Symfony/Component/Mime/Email.php
index fa01e39d24..940cf489c0 100644
--- a/src/Symfony/Component/Mime/Email.php
+++ b/src/Symfony/Component/Mime/Email.php
@@ -491,6 +491,7 @@ class Email extends Message
                 $attachment['inline'] = true;
                 $inlineParts[$name] = $part = $this->createDataPart($attachment);
                 $html = str_replace('cid:'.$name, 'cid:'.$part->getContentId(), $html);
+                $part->setName($part->getContentId());
                 continue 2;
             }
             $attachmentParts[] = $this->createDataPart($attachment);