diff --git a/.travis.yml b/.travis.yml
index 2588c77..1ae07fd 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,6 +9,6 @@ env:
 
 before_script:
   - curl -s http://getcomposer.org/installer | php
-  - php composer.phar install
+  - php -d memory_limit=-1 composer.phar install
 
 script: phpunit
diff --git a/Form/Type/DatetimeType.php b/Form/Type/DatetimeType.php
index be802aa..eb58415 100644
--- a/Form/Type/DatetimeType.php
+++ b/Form/Type/DatetimeType.php
@@ -159,7 +159,11 @@ public static function convertMalotToIntlFormater($formatter)
      */
     public function getParent()
     {
-        return \Symfony\Component\Form\Extension\Core\Type\DateTimeType::class;
+        if (method_exists('Symfony\Component\Form\AbstractType', 'getBlockPrefix')) {
+            return '\Symfony\Component\Form\Extension\Core\Type\DateTimeType';
+        }
+        
+        return 'datetime';
     }
     
     public function getName()