diff --git a/freesoftware/education/argumentation.en.xhtml b/freesoftware/education/argumentation.en.xhtml
index 315f4529ce..f2633d1e65 100644
--- a/freesoftware/education/argumentation.en.xhtml
+++ b/freesoftware/education/argumentation.en.xhtml
@@ -67,7 +67,7 @@
         <ul>
           <li><a href="/activities/yh4f/">Youth Hacking 4 Freedom</a></li>
           <li><a href="/activities/childrensbook/">Children's book</a></li>
-          <li><a href="lernenwiedieprofis.ch/">Learn like a pro (DE)</a></li>
+          <li><a href="https://lernenwiedieprofis.ch">Learn like a pro (DE)</a></li>
         </ul>
 
         </ul>