diff --git a/AdobeIms/Model/LogIn.php b/AdobeIms/Model/LogIn.php
index 0e3e261..79bf604 100644
--- a/AdobeIms/Model/LogIn.php
+++ b/AdobeIms/Model/LogIn.php
@@ -135,7 +135,7 @@ private function getExpiresTime(int $expiresIn): string
     {
         return $this->dateTime->gmtDate(
             self::DATE_FORMAT,
-            $this->dateTime->gmtTimestamp() + $expiresIn / 1000
+            $this->dateTime->gmtTimestamp() + (int)round($expiresIn / 1000)
         );
     }
 }