diff --git a/src/Symfony/Component/Security/Http/Firewall.php b/src/Symfony/Component/Security/Http/Firewall.php
index 7cd51ce21e..08d4873c28 100644
--- a/src/Symfony/Component/Security/Http/Firewall.php
+++ b/src/Symfony/Component/Security/Http/Firewall.php
@@ -138,7 +138,7 @@ class Firewall implements EventSubscriberInterface
             if (\is_callable($listener)) {
                 $listener($event);
             } else {
-                @trigger_error(sprintf('Calling the "%s::handle()" method from the firewall is deprecated since Symfony 4.3, implement "__invoke()" instead.', \get_class($this)), E_USER_DEPRECATED);
+                @trigger_error(sprintf('Calling the "%s::handle()" method from the firewall is deprecated since Symfony 4.3, implement "__invoke()" instead.', \get_class($listener)), E_USER_DEPRECATED);
                 $listener->handle($event);
             }