diff --git a/www/old-psyntax.html b/www/old-psyntax.html
index ef348a0..2b3e06d 100644
--- a/www/old-psyntax.html
+++ b/www/old-psyntax.html
@@ -173,7 +173,7 @@ require them.
 <p>
 <li>Two new derived forms, <tt>with-implicit</tt> and <tt>datum</tt>,
 and one new procedure, <tt>syntax-&gt;list</tt>, have been added.
-See the <a  href="http://www.scheme.com/csug7">Chez Scheme Version 7 User's Guide</a>
+See the <a href="//www.scheme.com/csug7/">Chez Scheme Version 7 User's Guide</a>
 for descriptions.
 
 <p>
@@ -184,7 +184,7 @@ for descriptions.
 <li>An identifier <tt><i>x</i></tt> imported from a module <tt><i>m</i></tt> is now treated
 in the importing context as if the corresponding export identifier had
 been present in the import form along with <tt><i>m</i></tt>.
-See the <a  href="http://www.scheme.com/csug7">Chez Scheme Version 7 User's Guide</a>
+See the <a href="//www.scheme.com/csug7/">Chez Scheme Version 7 User's Guide</a>
 for a description of the now current <tt>import</tt> semantics.
 </ul>
 <p>
@@ -528,9 +528,9 @@ and other list-processing operations.
 <p>
 <ul>
 <li>The portable syntax-case macro system is now up-to-date with respect to
-<a  href="http://www.scheme.com/tspl2/">The Scheme Programming
+<a href="//www.scheme.com/tspl2/">The Scheme Programming
 Language, second edition</a> and the
-<a  href="http://www.scheme.com/csug/">Chez Scheme User's
+<a href="//www.scheme.com/csug6/">Chez Scheme User's
 Guide</a>.
 </ul>
 <p>