diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
index ea64157fde9bc..443332f2cee92 100644
--- a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
+++ b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
@@ -339,10 +339,7 @@ private function addWorkflowSection(ArrayNodeDefinition $rootNode)
                                         ->defaultNull()
                                     ->end()
                                     ->arrayNode('initial_marking')
-                                        ->beforeNormalization()
-                                            ->ifTrue(function ($v) { return !\is_array($v); })
-                                            ->then(function ($v) { return [$v]; })
-                                        ->end()
+                                        ->beforeNormalization()->castToArray()->end()
                                         ->defaultValue([])
                                         ->prototype('scalar')->end()
                                     ->end()