diff --git a/shared/src/main/scala/scala/xml/MetaData.scala b/shared/src/main/scala/scala/xml/MetaData.scala
index 1affff4e0..cdb988518 100644
--- a/shared/src/main/scala/scala/xml/MetaData.scala
+++ b/shared/src/main/scala/scala/xml/MetaData.scala
@@ -225,4 +225,6 @@ abstract class MetaData
 
   final def remove(namespace: String, owner: Node, key: String): MetaData =
     remove(namespace, owner.scope, key)
+
+  protected[this] override def writeReplace(): AnyRef = this
 }
diff --git a/shared/src/main/scala/scala/xml/NodeSeq.scala b/shared/src/main/scala/scala/xml/NodeSeq.scala
index 97b2ddf2a..c99fe978c 100644
--- a/shared/src/main/scala/scala/xml/NodeSeq.scala
+++ b/shared/src/main/scala/scala/xml/NodeSeq.scala
@@ -155,4 +155,6 @@ abstract class NodeSeq extends AbstractSeq[Node] with immutable.Seq[Node] with S
   override def toString(): String = theSeq.mkString
 
   def text: String = (this map (_.text)).mkString
+
+  protected[this] override def writeReplace(): AnyRef = this
 }