diff --git a/_includes/sidebar.html b/_includes/sidebar.html
index cf14dd8..404a48c 100644
--- a/_includes/sidebar.html
+++ b/_includes/sidebar.html
@@ -34,7 +34,7 @@
   </div>
 
   <div class="source">
-    <a href="https://spdx.org/licenses/{{ page.spdx-id }}.html">
+    <a href="https://spdx.org/licenses/{{ page.spdx-id }}{% if xgpl %}-or-later{% endif %}.html">
       <span class="license-sprite"></span>
       Source
     </a>