diff --git a/module2/ressources/rr_org/init.el b/module2/ressources/rr_org/init.el
index eb85ea4c21062b600496b2ece241799149663695..611e6f07d314a99408b4c65bad95f0443685bfd7 100644
--- a/module2/ressources/rr_org/init.el
+++ b/module2/ressources/rr_org/init.el
@@ -60,6 +60,7 @@
 (setq package-archive-priorities '(("gnu" . 100)
                                    ("melpa-stable" . 10)))
 
+(require 'cl)
 (let* ((required-packages
         '(ess
           auctex
diff --git a/module2/ressources/rr_org/init.org b/module2/ressources/rr_org/init.org
index 0df6ec78642646c9c8c25791b3cbb41f889966f6..18a85d0554c35df69acdb7cfc8b6d856602ed166 100644
--- a/module2/ressources/rr_org/init.org
+++ b/module2/ressources/rr_org/init.org
@@ -85,6 +85,7 @@ document, simply =M-x org-babel-tangle=.
 #+END_SRC
 * Install packages
 #+begin_src emacs-lisp :tangle init.el
+(require 'cl)
 (let* ((required-packages
         '(ess
           auctex
diff --git a/module2/ressources/rr_org_archive.tgz b/module2/ressources/rr_org_archive.tgz
index a2160cc79a6e3825710f9ec274d45ff1d9f46caf..a440ca0b1c35d275d856ec3d4e92afc0b34e947d 100644
Binary files a/module2/ressources/rr_org_archive.tgz and b/module2/ressources/rr_org_archive.tgz differ