diff --git a/src/main/java/org/htmlunit/html/HtmlDomTreeWalker.java b/src/main/java/org/htmlunit/html/HtmlDomTreeWalker.java
index 594a3dc760..e2db02a441 100644
--- a/src/main/java/org/htmlunit/html/HtmlDomTreeWalker.java
+++ b/src/main/java/org/htmlunit/html/HtmlDomTreeWalker.java
@@ -14,6 +14,8 @@
*/
package org.htmlunit.html;
+import java.io.Serializable;
+
import org.w3c.dom.DOMException;
import org.w3c.dom.Node;
import org.w3c.dom.traversal.NodeFilter;
@@ -30,7 +32,7 @@
* @author Ahmed Ashour
* @author Ronald Brill
*/
-public class HtmlDomTreeWalker {
+public class HtmlDomTreeWalker implements Serializable {
private final DomNode root_;
private DomNode currentNode_;
diff --git a/src/test/java/org/htmlunit/html/HtmlDomTreeWalkerTest.java b/src/test/java/org/htmlunit/html/HtmlDomTreeWalkerTest.java
new file mode 100644
index 0000000000..42223a6313
--- /dev/null
+++ b/src/test/java/org/htmlunit/html/HtmlDomTreeWalkerTest.java
@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2002-2025 Gargoyle Software Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.htmlunit.html;
+
+import org.apache.commons.lang3.SerializationUtils;
+import org.htmlunit.SimpleWebTestCase;
+import org.htmlunit.junit.BrowserRunner;
+import org.junit.Assert;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+/**
+ * Tests for {@link HtmlDomTreeWalker}.
+ *
+ * @author Ronald Brill
+ */
+@RunWith(BrowserRunner.class)
+public class HtmlDomTreeWalkerTest extends SimpleWebTestCase {
+
+ /**
+ * @throws Exception if an error occurs
+ */
+ @Test
+ public void serialization() throws Exception {
+ final String html = "\n"
+ + "1
2
\n"
+ + "";
+
+ final HtmlPage page = loadPage(html);
+
+ final byte[] bytes = SerializationUtils.serialize(new HtmlDomTreeWalker(page.getBody(), 0, null, false));
+
+ final HtmlDomTreeWalker deserialized = (HtmlDomTreeWalker) SerializationUtils.deserialize(bytes);
+ Assert.assertEquals(page.getBody().getNodeName(), deserialized.getRoot().getNodeName());
+ }
+}