diff --git a/docs/classic-ui/viewlets.md b/docs/classic-ui/viewlets.md
index 60dffbdbb..61d51a405 100644
--- a/docs/classic-ui/viewlets.md
+++ b/docs/classic-ui/viewlets.md
@@ -215,7 +215,7 @@ For a somewhat more recent example, see {doc}`training-2023:mastering-plone-5/vi
 ```python
 """
 Facebook like viewlet for Plone.
-http://mfabrik.com
+https://mfabrik.com
 """
 
 import urllib