diff --git a/free-programming-books-es.md b/free-programming-books-es.md
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 ###Ruby on Rails
 
-* [El maldito libro de los Descarrilados](https://yottabi.com/mld.pdf) (PDF)
+* [El maldito libro de los Descarrilados](http://yottabi.com/mld.pdf) (PDF)
 
 ###R
 * [R para Principiantes](http://cran.r-project.org/doc/contrib/rdebuts_es.pdf)