diff --git a/doc/protocol.xml b/doc/protocol.xml
index 69bbc3b2f..c36c29a6b 100644
--- a/doc/protocol.xml
+++ b/doc/protocol.xml
@@ -67,7 +67,7 @@
         strings. For example: <returnvalue>OK</returnvalue> encoded in
         UTF-8 is simply <returnvalue>OK</returnvalue>.  For more
         information on UTF-8:
-        http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8)
+        <ulink url="http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8"/>)
       </para>
     </section>