diff --git a/patches/002-login-without-domain.patch b/patches/002-login-without-domain.patch
index 6e6706286120b34c1605ae32aa7756ef61e0956a..477bd803faf56e1a062103e877598642d49cbe68 100644
--- a/patches/002-login-without-domain.patch
+++ b/patches/002-login-without-domain.patch
@@ -17,7 +17,7 @@ diff --git files/LoginController.php files/LoginController-new.php
 +		$user = mb_strtolower($user, 'UTF-8');
 +		$domain = $this->config->getSystemValue("mail_domain");
 +		$domain_suffix = "@$domain";
-+		$admin_username = $_ENV["NEXTCLOUD_ADMIN_USER"];
++		$admin_username = mb_strtolower($_ENV["NEXTCLOUD_ADMIN_USER"], 'UTF-8');
 +		if (stristr($user, $domain_suffix) === FALSE && strcmp($user, $admin_username) != 0) {
 +			$user = $user . $domain_suffix;
 +		}