diff --git a/src/Symfony/Bridge/Twig/Extension/FormExtension.php b/src/Symfony/Bridge/Twig/Extension/FormExtension.php
index fff092f012cb..9c7339f70295 100644
--- a/src/Symfony/Bridge/Twig/Extension/FormExtension.php
+++ b/src/Symfony/Bridge/Twig/Extension/FormExtension.php
@@ -144,7 +144,7 @@ public function humanize($text)
     public function isSelectedChoice(ChoiceView $choice, $selectedValue)
     {
         if (is_array($selectedValue)) {
-            return false !== array_search($choice->value, $selectedValue, true);
+            return in_array($choice->value, $selectedValue, true);
         }
 
         return $choice->value === $selectedValue;
diff --git a/src/Symfony/Component/Form/Extension/Core/ChoiceList/ChoiceList.php b/src/Symfony/Component/Form/Extension/Core/ChoiceList/ChoiceList.php
index d9d00ef7d1ba..40e9d1a07537 100644
--- a/src/Symfony/Component/Form/Extension/Core/ChoiceList/ChoiceList.php
+++ b/src/Symfony/Component/Form/Extension/Core/ChoiceList/ChoiceList.php
@@ -381,7 +381,7 @@ protected function addChoice(array &$bucketForPreferred, array &$bucketForRemain
      */
     protected function isPreferred($choice, array $preferredChoices)
     {
-        return false !== array_search($choice, $preferredChoices, true);
+        return in_array($choice, $preferredChoices, true);
     }
 
     /**
diff --git a/src/Symfony/Component/Form/Extension/Core/Type/ChoiceType.php b/src/Symfony/Component/Form/Extension/Core/Type/ChoiceType.php
index dc241779c92c..5520119fdfc3 100644
--- a/src/Symfony/Component/Form/Extension/Core/Type/ChoiceType.php
+++ b/src/Symfony/Component/Form/Extension/Core/Type/ChoiceType.php
@@ -111,7 +111,7 @@ public function buildView(FormView $view, FormInterface $form, array $options)
         // avoid making the type check inside the closure.
         if ($options['multiple']) {
             $view->vars['is_selected'] = function ($choice, array $values) {
-                return false !== array_search($choice, $values, true);
+                return in_array($choice, $values, true);
             };
         } else {
             $view->vars['is_selected'] = function ($choice, $value) {