diff --git a/doc/src/sgml/libpq.sgml b/doc/src/sgml/libpq.sgml
index 0c33e36e067..8b453648957 100644
--- a/doc/src/sgml/libpq.sgml
+++ b/doc/src/sgml/libpq.sgml
@@ -6817,7 +6817,7 @@ ldap://ldap.acme.com/cn=dbserver,cn=hosts?pgconnectinfo?base?(objectclass=*)
    <application>libpq</application> will not also initialize those libraries.
    <!-- If this URL changes replace it with a URL to www.archive.org. -->
    See <ulink
-   url="http://h71000.www7.hp.com/doc/83final/BA554_90007/ch04.html"></ulink>
+   url="http://h71000.www7.hp.com/doc/83final/ba554_90007/ch04.html"></ulink>
    for details on the SSL API.
   </para>