diff --git a/reference/forms/types/options/choice_filter.rst.inc b/reference/forms/types/options/choice_filter.rst.inc
index 235e1d84ed9..66d06b19bbd 100644
--- a/reference/forms/types/options/choice_filter.rst.inc
+++ b/reference/forms/types/options/choice_filter.rst.inc
@@ -18,7 +18,7 @@ define a callable that takes each choice as the only argument and must return
 
     class AddressType extends AbstractType
     {
-        public function configureOptions(OptionsResolver $resolver)
+        public function configureOptions(OptionsResolver $resolver): void
         {
             $resolver
                 ->setDefaults([
@@ -28,7 +28,7 @@ define a callable that takes each choice as the only argument and must return
             ;
         }
 
-        public function buildForm(FormBuilderInterface $builder, array $options)
+        public function buildForm(FormBuilderInterface $builder, array $options): void
         {
             $allowedCountries = $options['allowed_countries'];