diff --git a/core/src/main/java/hudson/model/Hudson.java b/core/src/main/java/hudson/model/Hudson.java
index dfe6f2253189a3942e9ff5403208d9d76edb166e..8de284fe1542f792d2280cf5b024a4e5c0059625 100644
--- a/core/src/main/java/hudson/model/Hudson.java
+++ b/core/src/main/java/hudson/model/Hudson.java
@@ -2117,7 +2117,7 @@ public final class Hudson extends View implements ItemGroup<TopLevelItem>, Node,
     /**
      * Thread-safe reusable {@link XStream}.
      */
-    private static final XStream XSTREAM = new XStream2();
+    public static final XStream XSTREAM = new XStream2();
 
     /**
      * Thread pool used to load configuration in parallel, to improve the start up time.