-               //Add event listener on captcha
-               $builder->addEventListener(FormEvents::PRE_SUBMIT, [$this, 'validateCaptcha']);
-    }
+                       //Add event listener on captcha
+                       $builder->addEventListener(FormEvents::PRE_SUBMIT, [$this, 'validateCaptcha']);
+               }
+       }
+
+       /**
+        * {@inheritdoc}
+        */
+       public function configureOptions(OptionsResolver $resolver): void {
+               //Call parent configure options
+               parent::configureOptions($resolver);
+
+               //Set defaults
+               $resolver->setDefaults(['captcha' => false, 'error_bubbling' => true, 'translation_domain' => RapsysPackBundle::getAlias()]);
+
+               //Add extra captcha option
+               $resolver->setAllowedTypes('captcha', 'boolean');
+       }