diff --git a/src/Symfony/Bundle/MonologBundle/DependencyInjection/MonologExtension.php b/src/Symfony/Bundle/MonologBundle/DependencyInjection/MonologExtension.php
index 1af75f4b87..0d0ff0a1c1 100644
--- a/src/Symfony/Bundle/MonologBundle/DependencyInjection/MonologExtension.php
+++ b/src/Symfony/Bundle/MonologBundle/DependencyInjection/MonologExtension.php
@@ -76,6 +76,7 @@ class MonologExtension extends Extension
                 'Monolog\\Formatter\\LineFormatter',
                 'Monolog\\Handler\\HandlerInterface',
                 'Monolog\\Handler\\AbstractHandler',
+                'Monolog\\Handler\\AbstractProcessingHandler',
                 'Monolog\\Handler\\StreamHandler',
                 'Monolog\\Handler\\FingersCrossedHandler',
                 'Monolog\\Logger',