diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
index 4314f17204a1f..a20fde031316e 100644
--- a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
+++ b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
@@ -1047,7 +1047,7 @@ function ($a) {
                         ->end()
                         ->scalarNode('default_bus')->defaultValue(null)->end()
                         ->arrayNode('buses')
-                            ->defaultValue(array('default' => array('default_middleware' => true, 'middleware' => array())))
+                            ->defaultValue(array('messenger.bus.default' => array('default_middleware' => true, 'middleware' => array())))
                             ->useAttributeAsKey('name')
                             ->prototype('array')
                                 ->addDefaultsIfNotSet()
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/ConfigurationTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/ConfigurationTest.php
index 8ab7b79172197..d47c1be5526a9 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/ConfigurationTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/ConfigurationTest.php
@@ -263,7 +263,7 @@ class_exists(SemaphoreStore::class) && SemaphoreStore::isSupported() ? 'semaphor
                 'encoder' => 'messenger.transport.serializer',
                 'decoder' => 'messenger.transport.serializer',
                 'default_bus' => null,
-                'buses' => array('default' => array('default_middleware' => true, 'middleware' => array())),
+                'buses' => array('messenger.bus.default' => array('default_middleware' => true, 'middleware' => array())),
             ),
         );
     }