diff --git a/data/web/inc/prerequisites.inc.php b/data/web/inc/prerequisites.inc.php
index 6cfdd1ca..2e563077 100644
--- a/data/web/inc/prerequisites.inc.php
+++ b/data/web/inc/prerequisites.inc.php
@@ -67,7 +67,7 @@ $tfa = new RobThree\Auth\TwoFactorAuth($OTP_LABEL, 6, 30, 'sha1', $qrprovider);
 
 // FIDO2
 $formats = $GLOBALS['FIDO2_FORMATS'];
-$WebAuthn = new lbuchs\WebAuthn\WebAuthn('WebAuthn Library', $_SERVER['HTTP_HOST'], $formats);
+$WebAuthn = new lbuchs\WebAuthn\WebAuthn('WebAuthn Library', $_SERVER['SERVER_NAME'], $formats);
 // only include root ca's when needed
 if (getenv('WEBAUTHN_ONLY_TRUSTED_VENDORS') == 'y') $WebAuthn->addRootCertificates($_SERVER['DOCUMENT_ROOT'] . '/inc/lib/WebAuthn/rootCertificates');