diff --git a/snappymail/v/0.0.0/app/libraries/MailSo/Base/Xxtea.php b/snappymail/v/0.0.0/app/libraries/MailSo/Base/Xxtea.php
index ffd929839..2db251a86 100644
--- a/snappymail/v/0.0.0/app/libraries/MailSo/Base/Xxtea.php
+++ b/snappymail/v/0.0.0/app/libraries/MailSo/Base/Xxtea.php
@@ -132,7 +132,7 @@ class Xxtea
 		return $aV;
 	}
 
-	private static function int32(int $iN) : int
+	private static function int32($iN) : int
 	{
 		return $iN & 0xffffffff;
 	}