diff --git a/src/Symfony/Component/Mailer/Bridge/Mailgun/Tests/Transport/MailgunApiTransportTest.php b/src/Symfony/Component/Mailer/Bridge/Mailgun/Tests/Transport/MailgunApiTransportTest.php
index 4e4ab66140447..08879782a0bc3 100644
--- a/src/Symfony/Component/Mailer/Bridge/Mailgun/Tests/Transport/MailgunApiTransportTest.php
+++ b/src/Symfony/Component/Mailer/Bridge/Mailgun/Tests/Transport/MailgunApiTransportTest.php
@@ -98,14 +98,8 @@ public function testCustomHeader()
         $this->assertEquals('amp-html-value', $payload['amp-html']);
     }
 
-    /**
-     * @legacy
-     */
     public function testPrefixHeaderWithH()
     {
-        $json = json_encode(['foo' => 'bar']);
-        $deliveryTime = (new \DateTimeImmutable('2020-03-20 13:01:00'))->format(\DateTimeInterface::RFC2822);
-
         $email = new Email();
         $email->getHeaders()->addTextHeader('h:bar', 'bar-value');