diff --git a/src/Forms/ControlGroup.php b/src/Forms/ControlGroup.php
index 974e862d..215a5c65 100644
--- a/src/Forms/ControlGroup.php
+++ b/src/Forms/ControlGroup.php
@@ -15,7 +15,7 @@
 /**
  * A user group of form controls.
  */
-final class ControlGroup
+class ControlGroup
 {
 	protected \WeakMap $controls;
 	private array $options = [];