diff --git a/src/Symfony/Component/Serializer/Normalizer/DateTimeNormalizer.php b/src/Symfony/Component/Serializer/Normalizer/DateTimeNormalizer.php
index 82b9b70deb2ac..144db87b01aa7 100644
--- a/src/Symfony/Component/Serializer/Normalizer/DateTimeNormalizer.php
+++ b/src/Symfony/Component/Serializer/Normalizer/DateTimeNormalizer.php
@@ -38,6 +38,11 @@ class DateTimeNormalizer implements NormalizerInterface, DenormalizerInterface,
     ];
 
     public function __construct(array $defaultContext = [])
+    {
+        $this->setDefaultContext($defaultContext);
+    }
+
+    public function setDefaultContext(array $defaultContext): void
     {
         $this->defaultContext = array_merge($this->defaultContext, $defaultContext);
     }