diff --git a/src/Contentful.php b/src/Contentful.php
index 49159dc..e3b5e50 100644
--- a/src/Contentful.php
+++ b/src/Contentful.php
@@ -254,7 +254,7 @@ public function getContentTypes(array $parameters = [], $space = null, array $op
             'content_types',
             '',
             $parameters,
-            $options
+            array_merge($options, ['include_level' => null])
         );
     }