diff --git a/freesoftware/sustainability/sustainability.en.xhtml b/freesoftware/sustainability/sustainability.en.xhtml
index 835d99b3fa..b6f1f78cf3 100644
--- a/freesoftware/sustainability/sustainability.en.xhtml
+++ b/freesoftware/sustainability/sustainability.en.xhtml
@@ -352,7 +352,7 @@
 
   <p>
   As explained in <a
-  href="examining-the-sustainability-of-free-software"> Chapter
+  href="#examining-the-sustainability-of-free-software"> Chapter
   1</a>, any Free Software  can be used by any actor at any time and
   for any purpose. The resource can be used unlimited in terms of
   space and time. <strong>With Free Software, dependencies on
@@ -438,7 +438,7 @@ Software enables sustainable ecosystems</h3>
   preservation of the resource. Most of these actors have invested
   time and energy in the resource and have built their
   infrastructures or business models on top of it. As explained in <a
-  href="free-software-is-the-base-for-sustainable-it-infrastructures">
+  href="#free-software-is-the-base-for-sustainable-it-infrastructures">
   Chapter 2.1</a>, a loss of the resource would undermine entire IT
   infrastructures. That is why the actors all have the same interest
   that the common resource not only be preserved but even developed