diff --git a/htmlcssguide.xml b/htmlcssguide.xml
index b767a81..738c050 100644
--- a/htmlcssguide.xml
+++ b/htmlcssguide.xml
@@ -248,7 +248,7 @@
         </p>
         
         <p>
-          Use tools such as the <a href="http://validator.w3.org/">W3C
+          Use tools such as the <a href="http://validator.w3.org/nu/">W3C
           HTML validator</a> to test.
         </p>
         <p>