diff --git a/src/ConfigurationData.php b/src/ConfigurationData.php
index 7262b84..fc29da1 100644
--- a/src/ConfigurationData.php
+++ b/src/ConfigurationData.php
@@ -22,7 +22,7 @@ final class ConfigurationData
 
     #[Assert\Collection(
         allowExtraFields: false,
-        fields: ['docroot' => new Assert\Choice(['web', 'docroot'])],
+        fields: ['docroot' => new Assert\Choice([null, 'web', 'docroot'])],
     )]
     public array $drupal;