diff --git a/Type/CaptchaType.php b/Type/CaptchaType.php
index 86d5ddb..bf629a3 100644
--- a/Type/CaptchaType.php
+++ b/Type/CaptchaType.php
@@ -71,7 +71,7 @@ class CaptchaType extends AbstractType
             $options['humanity']
         );
 
-        $builder->addEventListener(FormEvents::POST_BIND, array($validator, 'validate'));
+        $builder->addEventListener(FormEvents::POST_SUBMIT, array($validator, 'validate'));
     }
 
     /**