diff --git a/src/Symfony/Component/Form/ChoiceList/ArrayChoiceList.php b/src/Symfony/Component/Form/ChoiceList/ArrayChoiceList.php
index b1e6b3bf06b5c..6b0c8f5c65062 100644
--- a/src/Symfony/Component/Form/ChoiceList/ArrayChoiceList.php
+++ b/src/Symfony/Component/Form/ChoiceList/ArrayChoiceList.php
@@ -233,7 +233,7 @@ private function castableToString(array $choices, array &$cache = array())
                 }
 
                 continue;
-            } elseif (!is_scalar($choice)) {
+            } elseif (!is_scalar($choice) || false === $choice) {
                 return false;
             } elseif (isset($cache[(string) $choice])) {
                 return false;