diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
index 855bf6f81f..38eac5879a 100644
--- a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
+++ b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
@@ -217,7 +217,7 @@ class Configuration implements ConfigurationInterface
                             ->fixXmlConfig('resource')
                             ->children()
                                 ->arrayNode('resources')
-                                    ->addDefaultChildrenWhenNoneSet()
+                                    ->addDefaultChildrenIfNoneSet()
                                     ->prototype('scalar')->defaultValue('FrameworkBundle:Form')->end()
                                     ->validate()
                                         ->ifTrue(function($v) {return !in_array('FrameworkBundle:Form', $v); })
diff --git a/src/Symfony/Bundle/TwigBundle/DependencyInjection/Configuration.php b/src/Symfony/Bundle/TwigBundle/DependencyInjection/Configuration.php
index 9829fad629..9802094b70 100644
--- a/src/Symfony/Bundle/TwigBundle/DependencyInjection/Configuration.php
+++ b/src/Symfony/Bundle/TwigBundle/DependencyInjection/Configuration.php
@@ -54,7 +54,7 @@ class Configuration implements ConfigurationInterface
                     ->fixXmlConfig('resource')
                     ->children()
                         ->arrayNode('resources')
-                            ->addDefaultChildrenWhenNoneSet()
+                            ->addDefaultChildrenIfNoneSet()
                             ->prototype('scalar')->defaultValue('form_div_layout.html.twig')->end()
                             ->setExample(array('MyBundle::form.html.twig'))
                             ->validate()
diff --git a/src/Symfony/Component/Config/Definition/Builder/ArrayNodeDefinition.php b/src/Symfony/Component/Config/Definition/Builder/ArrayNodeDefinition.php
index 4ac4b18895..4717e5e2dd 100644
--- a/src/Symfony/Component/Config/Definition/Builder/ArrayNodeDefinition.php
+++ b/src/Symfony/Component/Config/Definition/Builder/ArrayNodeDefinition.php
@@ -109,7 +109,7 @@ class ArrayNodeDefinition extends NodeDefinition implements ParentNodeDefinition
      *
      * @return ArrayNodeDefinition
      */
-    public function addDefaultChildrenWhenNoneSet($children = null)
+    public function addDefaultChildrenIfNoneSet($children = null)
     {
         $this->addDefaultChildren = null === $children ? 'defaults' : $children;
 
@@ -369,6 +369,12 @@ class ArrayNodeDefinition extends NodeDefinition implements ParentNodeDefinition
                 sprintf('->defaultValue() is not applicable to concrete nodes at path "%s"', $path)
             );
         }
+
+        if (false !== $this->addDefaultChildren) {
+            throw new InvalidDefinitionException(
+                sprintf('->addDefaultChildrenIfNoneSet() is not applicable to concrete nodes at path "%s"', $path)
+            );
+        }
     }
 
     /**
diff --git a/tests/Symfony/Tests/Component/Config/Definition/Builder/ArrayNodeDefinitionTest.php b/tests/Symfony/Tests/Component/Config/Definition/Builder/ArrayNodeDefinitionTest.php
index 35d62a8b3e..93903c6302 100644
--- a/tests/Symfony/Tests/Component/Config/Definition/Builder/ArrayNodeDefinitionTest.php
+++ b/tests/Symfony/Tests/Component/Config/Definition/Builder/ArrayNodeDefinitionTest.php
@@ -49,6 +49,7 @@ class ArrayNodeDefinitionTest extends \PHPUnit_Framework_TestCase
     {
         return array(
             array('defaultValue', array(array())),
+            array('addDefaultChildrenIfNoneSet', array()),
             array('requiresAtLeastOneElement', array()),
             array('useAttributeAsKey', array('foo'))
         );
@@ -72,7 +73,7 @@ class ArrayNodeDefinitionTest extends \PHPUnit_Framework_TestCase
         $node = new ArrayNodeDefinition('root');
         $node
             ->defaultValue(array())
-            ->addDefaultChildrenWhenNoneSet('foo')
+            ->addDefaultChildrenIfNoneSet('foo')
             ->prototype('array')
         ;
         $node->getNode();
@@ -82,7 +83,7 @@ class ArrayNodeDefinitionTest extends \PHPUnit_Framework_TestCase
     {
         $node = new ArrayNodeDefinition('root');
         $node
-            ->addDefaultChildrenWhenNoneSet()
+            ->addDefaultChildrenIfNoneSet()
             ->prototype('array')
         ;
         $tree = $node->getNode();
@@ -93,7 +94,7 @@ class ArrayNodeDefinitionTest extends \PHPUnit_Framework_TestCase
     {
         $node = new ArrayNodeDefinition('root');
         $node
-            ->addDefaultChildrenWhenNoneSet()
+            ->addDefaultChildrenIfNoneSet()
             ->prototype('array')
                   ->prototype('array')
         ;