diff --git a/libstdc++-v3/doc/html/manual/facets.html b/libstdc++-v3/doc/html/manual/facets.html
index 0ca45e3cc4e..2dd36307fcd 100644
--- a/libstdc++-v3/doc/html/manual/facets.html
+++ b/libstdc++-v3/doc/html/manual/facets.html
@@ -456,7 +456,7 @@ codecvt usage.
       A brief description of Normative Addendum 1
 	</a>
       </em>. </span><span class="author"><span class="firstname">Clive</span> <span class="surname">Feather</span>. </span><span class="pagenums">Extended Character Sets. </span></p></div><div class="biblioentry"><a id="id-1.3.4.6.3.3.8.10"></a><p><span class="title"><em>
-	<a class="link" href="http://tldp.org/HOWTO/Unicode-HOWTO.html" target="_top">
+	<a class="link" href="https://tldp.org/HOWTO/Unicode-HOWTO.html" target="_top">
 	  The Unicode HOWTO
 	</a>
       </em>. </span><span class="author"><span class="firstname">Bruno</span> <span class="surname">Haible</span>. </span></p></div><div class="biblioentry"><a id="id-1.3.4.6.3.3.8.11"></a><p><span class="title"><em>
diff --git a/libstdc++-v3/doc/xml/manual/codecvt.xml b/libstdc++-v3/doc/xml/manual/codecvt.xml
index d6158db7c75..395a2cfa9da 100644
--- a/libstdc++-v3/doc/xml/manual/codecvt.xml
+++ b/libstdc++-v3/doc/xml/manual/codecvt.xml
@@ -662,7 +662,7 @@ codecvt usage.
   <biblioentry>
       <title>
 	<link xmlns:xlink="http://www.w3.org/1999/xlink"
-	      xlink:href="http://tldp.org/HOWTO/Unicode-HOWTO.html">
+	      xlink:href="https://tldp.org/HOWTO/Unicode-HOWTO.html">
 	  The Unicode HOWTO
 	</link>
       </title>