diff --git a/Parser/FormTypeParser.php b/Parser/FormTypeParser.php
index dadc16b..4501902 100644
--- a/Parser/FormTypeParser.php
+++ b/Parser/FormTypeParser.php
@@ -56,7 +56,11 @@ class FormTypeParser
 
         $parameters = array();
         foreach ($builder->all() as $name => $child) {
-            $childBuilder = $builder->create($name, $child['type'] ?: 'text', $child['options']);
+            if ($child instanceof FormBuilder) {
+                $childBuilder = $child;
+            } else {
+                $childBuilder = $builder->create($name, $child['type'] ?: 'text', $child['options']);
+            }
 
             $bestType = '';
             foreach ($childBuilder->getTypes() as $type) {
diff --git a/Tests/Fixtures/Form/TestType.php b/Tests/Fixtures/Form/TestType.php
index a6a1b08..004e4e9 100644
--- a/Tests/Fixtures/Form/TestType.php
+++ b/Tests/Fixtures/Form/TestType.php
@@ -23,6 +23,7 @@ class TestType extends AbstractType
     {
         $builder->add('a', null, array('description' => 'A nice description'));
         $builder->add('b');
+        $builder->add($builder->create('c', 'checkbox'));
     }
 
     /**
diff --git a/Tests/Fixtures/Model/Test.php b/Tests/Fixtures/Model/Test.php
index 96992b8..4ee1dfd 100644
--- a/Tests/Fixtures/Model/Test.php
+++ b/Tests/Fixtures/Model/Test.php
@@ -24,4 +24,6 @@ class Test
      * @Assert\Type("DateTime");
      */
     public $b;
+
+    public $c;
 }
diff --git a/Tests/Formatter/MarkdownFormatterTest.php b/Tests/Formatter/MarkdownFormatterTest.php
index 33b3157..a2ae4f3 100644
--- a/Tests/Formatter/MarkdownFormatterTest.php
+++ b/Tests/Formatter/MarkdownFormatterTest.php
@@ -75,6 +75,11 @@ b:
   * type: string
   * required: true
 
+c:
+
+  * type: boolean
+  * required: true
+
 
 ### `POST` /tests ###
 
@@ -93,6 +98,11 @@ b:
   * type: string
   * required: true
 
+c:
+
+  * type: boolean
+  * required: true
+
 
 
 # others #
diff --git a/Tests/Formatter/SimpleFormatterTest.php b/Tests/Formatter/SimpleFormatterTest.php
index 0780255..73d4ffa 100644
--- a/Tests/Formatter/SimpleFormatterTest.php
+++ b/Tests/Formatter/SimpleFormatterTest.php
@@ -97,6 +97,12 @@ class SimpleFormatterTest extends WebTestCase
                             'required' => true,
                             'description' => '',
                         ),
+                        'c' =>
+                        array(
+                            'dataType' => 'boolean',
+                            'required' => true,
+                            'description' => '',
+                        ),
                     ),
                     'description' => 'create test',
                 ),
@@ -121,6 +127,12 @@ class SimpleFormatterTest extends WebTestCase
                             'required' => true,
                             'description' => '',
                         ),
+                        'c' =>
+                        array(
+                            'dataType' => 'boolean',
+                            'required' => true,
+                            'description' => '',
+                        ),
                     ),
                     'description' => 'create test',
                 ),