diff --git a/DependencyInjection/MonologExtension.php b/DependencyInjection/MonologExtension.php
index b219bea5..1921c15f 100644
--- a/DependencyInjection/MonologExtension.php
+++ b/DependencyInjection/MonologExtension.php
@@ -81,6 +81,8 @@ public function load(array $configs, ContainerBuilder $container)
                 'Monolog\\Logger',
                 'Symfony\\Bridge\\Monolog\\Logger',
                 'Symfony\\Bridge\\Monolog\\Handler\\DebugHandler',
+                'Monolog\\Handler\\FingersCrossed\\ActivationStrategyInterface',
+                'Monolog\\Handler\\FingersCrossed\\ErrorLevelActivationStrategy',
             ));
         }
     }