diff --git a/mozilla/java/dom/tests/src/DocumentImpl.java b/mozilla/java/dom/tests/src/DocumentImpl.java
index ebe6f0fd412..446f3627732 100644
--- a/mozilla/java/dom/tests/src/DocumentImpl.java
+++ b/mozilla/java/dom/tests/src/DocumentImpl.java
@@ -89,4 +89,9 @@ public class DocumentImpl extends NodeImpl implements Document, DocumentEvent {
     public NodeList getElementsByTagNameNS(String namespaceURI, String localName) {
         throw new UnsupportedOperationException();
     }
+
+   public Element getElementById(String elementId) {
+        throw new UnsupportedOperationException();
+    };
+
 }