diff --git a/src/Bundle/ChillCustomFieldsBundle/Form/Extension/PostTextNumberExtension.php b/src/Bundle/ChillCustomFieldsBundle/Form/Extension/PostTextNumberExtension.php
index 0e1147a09..1303744ce 100644
--- a/src/Bundle/ChillCustomFieldsBundle/Form/Extension/PostTextNumberExtension.php
+++ b/src/Bundle/ChillCustomFieldsBundle/Form/Extension/PostTextNumberExtension.php
@@ -18,7 +18,7 @@ use Symfony\Component\Form\Extension\Core\Type\NumberType;
  */
 class PostTextNumberExtension extends PostTextExtension
 {
-    public function getExtendedTypes(): iterable
+    public static function getExtendedTypes(): iterable
     {
         return [NumberType::class];
     }