--- a/web/entries/AVL-Trees.shtml
+++ b/web/entries/AVL-Trees.shtml
@@ -34,7 +34,7 @@
         <td class="data" width="80%">AVL Trees</td></tr>
 
     <tr><td class="datahead">Author:</td>
-        <td class="data"><a href="http://www4.in.tum.de/~nipkow/">Tobias Nipkow</a> and Cornelia Pusch</td></tr>
+        <td class="data"><a href="http://www.in.tum.de/~nipkow/">Tobias Nipkow</a> and Cornelia Pusch</td></tr>
 
     <tr><td class="datahead">Submission date:</td>
         <td class="data">2004-03-19</td></tr>