diff --git a/src/libraries/System.Private.DataContractSerialization/src/System/Xml/XmlDictionaryAsyncCheckWriter.cs b/src/libraries/System.Private.DataContractSerialization/src/System/Xml/XmlDictionaryAsyncCheckWriter.cs
index cbb815091a66a85000092ab7d45a5430b6e00006..ae19fc44bc2070cb38ef3dd958c2d5221560acd4 100644
--- a/src/libraries/System.Private.DataContractSerialization/src/System/Xml/XmlDictionaryAsyncCheckWriter.cs
+++ b/src/libraries/System.Private.DataContractSerialization/src/System/Xml/XmlDictionaryAsyncCheckWriter.cs
@@ -3,6 +3,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.IO;
 using System.Linq;
 using System.Runtime.CompilerServices;
@@ -11,13 +12,14 @@
 
 namespace System.Xml
 {
-    internal sealed class XmlDictionaryAsyncCheckWriter : XmlDictionaryWriter
+    internal sealed class XmlDictionaryAsyncCheckWriter : XmlDictionaryWriter, IXmlTextWriterInitializer
     {
         private readonly XmlDictionaryWriter _coreWriter;
         private Task? _lastTask;
 
         public XmlDictionaryAsyncCheckWriter(XmlDictionaryWriter writer)
         {
+            Debug.Assert(writer is IXmlTextWriterInitializer);
             _coreWriter = writer;
         }
 
@@ -694,5 +696,14 @@ protected override void Dispose(bool disposing)
             CheckAsync();
             CoreWriter.Dispose();
         }
+
+        public void SetOutput(Stream stream, Encoding encoding, bool ownsStream)
+        {
+            if (CoreWriter is IXmlTextWriterInitializer initializer)
+            {
+                CheckAsync();
+                initializer.SetOutput(stream, encoding, ownsStream);
+            }
+        }
     }
 }