diff --git a/doctrine/events.rst b/doctrine/events.rst
index c98be25d736..30b48856c13 100644
--- a/doctrine/events.rst
+++ b/doctrine/events.rst
@@ -76,7 +76,7 @@ define a callback for the ``prePersist`` Doctrine event:
              */
             public function setCreatedAtValue(): void
             {
-                $this->createdAt = new \DateTime();
+                $this->createdAt = new \DateTimeImmutable();
             }
         }