diff --git a/src/ForwardAuthServiceProvider.php b/src/ForwardAuthServiceProvider.php
index 6924f63..4f437f1 100644
--- a/src/ForwardAuthServiceProvider.php
+++ b/src/ForwardAuthServiceProvider.php
@@ -22,6 +22,6 @@ protected function lookupType($type) {
             'ldap' => AuthServices\LdapAuthService::class,
         ];
 
-        return $types[$type];
+        return $types[$type] ?? $type;
     }
 }