diff --git a/irc/irc.php b/irc/irc.php
index fb675c26..4cb99c3f 100644
--- a/irc/irc.php
+++ b/irc/irc.php
@@ -109,7 +109,7 @@ function irc_content(&$a) {
 /* add the chatroom frame and some html */
   $o .= <<< EOT
 <h2>IRC chat</h2>
-<p><a href="http://tldp.org/HOWTO/IRC/beginners.html" target="_blank" rel="noopener noreferrer">A beginner's guide to using IRC. [en]</a></p>
+<p><a href="https://tldp.org/HOWTO/IRC/beginners.html" target="_blank" rel="noopener noreferrer">A beginner's guide to using IRC. [en]</a></p>
 <iframe src="//web.libera.chat?channels=$channels" style="width:100%; max-width:900px; height: 600px;"></iframe>
 EOT;