diff --git a/src/Symfony/Component/Serializer/Encoder/JsonEncode.php b/src/Symfony/Component/Serializer/Encoder/JsonEncode.php
index 86baf99994eb6..898b69db8977d 100644
--- a/src/Symfony/Component/Serializer/Encoder/JsonEncode.php
+++ b/src/Symfony/Component/Serializer/Encoder/JsonEncode.php
@@ -23,7 +23,7 @@ class JsonEncode implements EncoderInterface
     public const OPTIONS = 'json_encode_options';
 
     private $defaultContext = [
-        self::OPTIONS => 0,
+        self::OPTIONS => \JSON_PRESERVE_ZERO_FRACTION,
     ];
 
     public function __construct(array $defaultContext = [])