diff --git a/src/Symfony/Bridge/Twig/Resources/views/Form/bootstrap_4_layout.html.twig b/src/Symfony/Bridge/Twig/Resources/views/Form/bootstrap_4_layout.html.twig
index 44141f1b38..43c031b933 100644
--- a/src/Symfony/Bridge/Twig/Resources/views/Form/bootstrap_4_layout.html.twig
+++ b/src/Symfony/Bridge/Twig/Resources/views/Form/bootstrap_4_layout.html.twig
@@ -106,8 +106,7 @@
 {%- endblock dateinterval_widget %}
 
 {% block percent_widget -%}
-    <div class="input-group{{ not valid ? ' form-control is-invalid' }}">
-        {% set valid = true %}
+    <div class="input-group">
         {{- block('form_widget_simple') -}}
         <div class="input-group-append">
             <span class="input-group-text">%</span>