diff --git a/src/Symfony/Component/Mime/Part/TextPart.php b/src/Symfony/Component/Mime/Part/TextPart.php
index 549a5fe1e02fe..bddca0a2b474f 100644
--- a/src/Symfony/Component/Mime/Part/TextPart.php
+++ b/src/Symfony/Component/Mime/Part/TextPart.php
@@ -218,7 +218,7 @@ private function chooseEncoding(): string
public function __sleep(): array
{
// convert resources to strings for serialization
- if (null !== $this->seekable) {
+ if (null !== $this->seekable || $this->body instanceof File) {
$this->body = $this->getBody();
$this->seekable = null;
}
diff --git a/src/Symfony/Component/Mime/Tests/EmailTest.php b/src/Symfony/Component/Mime/Tests/EmailTest.php
index f5ffbb7638429..8dba651ffb882 100644
--- a/src/Symfony/Component/Mime/Tests/EmailTest.php
+++ b/src/Symfony/Component/Mime/Tests/EmailTest.php
@@ -483,6 +483,7 @@ public function testSerialize()
$name = __DIR__.'/Fixtures/mimetypes/test';
$file = fopen($name, 'r');
$e->addPart(new DataPart($file, 'test'));
+ $e->attachFromPath($name, 'same_test');
$expected = clone $e;
$n = unserialize(serialize($e));
$this->assertEquals($expected->getHeaders(), $n->getHeaders());
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