diff --git a/src/Symfony/Component/Serializer/Normalizer/MimeMessageNormalizer.php b/src/Symfony/Component/Serializer/Normalizer/MimeMessageNormalizer.php
index 5f599ba655b6f..cd6f64bc4c37c 100644
--- a/src/Symfony/Component/Serializer/Normalizer/MimeMessageNormalizer.php
+++ b/src/Symfony/Component/Serializer/Normalizer/MimeMessageNormalizer.php
@@ -64,6 +64,10 @@ public function normalize(mixed $object, string $format = null, array $context =
             $ret['class'] = $object::class;
             unset($ret['seekable'], $ret['cid']);
 
+            if (class_exists(BodyFile::class)) {
+                unset($ret['seekable'], $ret['cid']);
+            }
+
             return $ret;
         }