diff --git a/src/IdP/ADFS.php b/src/IdP/ADFS.php
index 3442d5c..c3fb2b9 100644
--- a/src/IdP/ADFS.php
+++ b/src/IdP/ADFS.php
@@ -52,7 +52,11 @@ public static function receiveAuthnRequest(Request $request, IdP $idp): Streamed
             $state['adfs:wreply'] = $httpUtils->checkURLAllowed($query['wreply']);
         }
 
-        return new StreamedResponse([$idp, 'handleAuthenticationRequest'], [&$state]);
+        return new StreamedResponse(
+            function () use ($idp, $state) {
+                $idp->handleAuthenticationRequest($state);
+            }
+        );
     }