diff --git a/api/src/main/java/jakarta/xml/ws/Holder.java b/api/src/main/java/jakarta/xml/ws/Holder.java
index 86f959b..53215a3 100644
--- a/api/src/main/java/jakarta/xml/ws/Holder.java
+++ b/api/src/main/java/jakarta/xml/ws/Holder.java
@@ -25,7 +25,7 @@ public final class Holder<T> implements Serializable {
     /**
      * The value contained in the holder.
      */
-    public T value;
+    public transient T value;
 
     /**
      * Creates a new holder with a {@code null} value.