diff --git a/php/federator/api/wellknown/webfinger.php b/php/federator/api/wellknown/webfinger.php
index 584c53d..e3b3346 100644
--- a/php/federator/api/wellknown/webfinger.php
+++ b/php/federator/api/wellknown/webfinger.php
@@ -49,7 +49,7 @@ class WebFinger
         $config = $this->main->getConfig();
         $domain = $config['generic']['externaldomain'];
         $sourcedomain = $config['generic']['sourcedomain'];
-        if (preg_match("/^acct:([^@]+)@(.*)$/", $_resource, $matches) != 1 || $matches[2] !== $sourcedomain) {
+        if (preg_match("/^acct:([^@]+)@(.*)$/", $_resource, $matches) != 1 || ($matches[2] !== $sourcedomain && $matches[2] !== $domain)) {
             throw new \Federator\Exceptions\InvalidArgument();
         }
         $user = \Federator\DIO\User::getUserByName(