diff --git a/src/Symfony/Bridge/Doctrine/PropertyInfo/DoctrineExtractor.php b/src/Symfony/Bridge/Doctrine/PropertyInfo/DoctrineExtractor.php
index c0528defcd9e..681aa24e327a 100644
--- a/src/Symfony/Bridge/Doctrine/PropertyInfo/DoctrineExtractor.php
+++ b/src/Symfony/Bridge/Doctrine/PropertyInfo/DoctrineExtractor.php
@@ -201,7 +201,7 @@ public function getTypes($class, $property, array $context = [])
                     }
                 case Type::BUILTIN_TYPE_INT:
                 case Type::BUILTIN_TYPE_STRING:
-                    if ($enumType !== null) {
+                    if ($enumType) {
                         return [$enumType];
                     }
                     break;