diff --git a/test/functional/HmacTokenTest.php b/test/functional/HmacTokenTest.php
index d87771a65..de4ff146e 100644
--- a/test/functional/HmacTokenTest.php
+++ b/test/functional/HmacTokenTest.php
@@ -3,6 +3,7 @@
 
 namespace Lcobucci\JWT\FunctionalTests;
 
+use DateTimeImmutable;
 use Lcobucci\JWT\Configuration;
 use Lcobucci\JWT\Signer\Hmac\Sha256;
 use Lcobucci\JWT\Signer\Hmac\Sha512;
@@ -131,4 +132,28 @@ public function everythingShouldWorkWhenUsingATokenGeneratedByOtherLibs(): void
         self::assertTrue($this->config->validator()->validate($token, $constraint));
         self::assertEquals('world', $token->claims()->get('hello'));
     }
+
+    /**
+     * @test
+     * @dataProvider datesWithPotentialRoundingIssues
+     */
+    public function timeFractionsPrecisionsAreRespected(DateTimeImmutable $issuedAt): void
+    {
+        $token = $this->config->builder()
+            ->issuedAt($issuedAt)
+            ->getToken($this->config->signer(), $this->config->signingKey());
+
+        $parsedToken = $this->config->parser()->parse($token->toString());
+
+        self::assertInstanceOf(Token\Plain::class, $parsedToken);
+        self::assertSame($issuedAt->format('U.u'), $parsedToken->claims()->get('iat')->format('U.u'));
+    }
+
+    public function datesWithPotentialRoundingIssues(): iterable
+    {
+        yield [DateTimeImmutable::createFromFormat('U.u', '1613938511.017448')];
+        yield [DateTimeImmutable::createFromFormat('U.u', '1613938511.023691')];
+        yield [DateTimeImmutable::createFromFormat('U.u', '1613938511.018045')];
+        yield [DateTimeImmutable::createFromFormat('U.u', '1616074725.008455')];
+    }
 }