diff --git a/en_US.ISO8859-1/books/handbook/advanced-networking/chapter.sgml b/en_US.ISO8859-1/books/handbook/advanced-networking/chapter.sgml
index 969b958617..b76a4724ae 100644
--- a/en_US.ISO8859-1/books/handbook/advanced-networking/chapter.sgml
+++ b/en_US.ISO8859-1/books/handbook/advanced-networking/chapter.sgml
@@ -2763,7 +2763,7 @@ Exports list on foobar:
     </indexterm>
 
     <para>A good resource for information on ISDN technology and hardware is
-      <ulink url="http://alumni.caltech.edu/~dank/isdn/">Dan Kegel's ISDN
+      <ulink url="http://www.alumni.caltech.edu/~dank/isdn/">Dan Kegel's ISDN
 	Page</ulink>.</para>
 
     <para>A quick simple road map to ISDN follows:</para>