diff --git a/src/FormElement/Checkbox.php b/src/FormElement/Checkbox.php
index <HASH>..<HASH> 100644
--- a/src/FormElement/Checkbox.php
+++ b/src/FormElement/Checkbox.php
@@ -14,9 +14,7 @@ class Checkbox extends AbstractFormElement
     protected function attachDefaultValidators(InputInterface $input, DOMElement $element)
     {
         // Make sure the submitted value is the same as the original
-        if ($element->hasAttribute('checked')) {
-            $input->getValidatorChain()
-                  ->attach(new Validator\Identical($element->getAttribute('value')));
-        }
+        $input->getValidatorChain()
+              ->attach(new Validator\Identical($element->getAttribute('value')));
     }
 }
Checkbox should always check the submitted value