diff --git a/docs/LEARNING.md b/docs/LEARNING.md
index 1e07b5dc..43f8215f 100644
--- a/docs/LEARNING.md
+++ b/docs/LEARNING.md
@@ -6,5 +6,4 @@
 - [Seven Languages in Seven Weeks by Bruce A. Tate - Chapter 4](https://pragprog.com/book/btlang/seven-languages-in-seven-weeks)
 - [Learn Prolog Now](http://www.learnprolognow.org)
 - [Learn X in Y Minutes](https://learnxinyminutes.com/docs/prolog/)
-- [99 Prolog Problems ](https://sites.google.com/site/prologsite/home)
 - [The Power of Prolog](https://www.metalevel.at/prolog) (including [videos](https://www.metalevel.at/prolog/videos/))