diff --git a/src/DependencyInjection/Configuration.php b/src/DependencyInjection/Configuration.php
index 6405833d..72a7ff05 100644
--- a/src/DependencyInjection/Configuration.php
+++ b/src/DependencyInjection/Configuration.php
@@ -39,7 +39,7 @@ public function getConfigTreeBuilder()
                 ->ifTrue(function ($v) {
                     return isset($v['factory_class']);
                 })
-                ->then(function ($v) {
+                ->then(function () {
                     trigger_error('The ClientFactory class is deprecated since version 1.3 and will be removed in 2.0. Use the \'csa_guzzle.client\' tag instead', E_USER_DEPRECATED);
                 })
             ->end()