diff --git a/modules/prelude-common-lisp.el b/modules/prelude-common-lisp.el
index 2aa98fb..1fd25e8 100644
--- a/modules/prelude-common-lisp.el
+++ b/modules/prelude-common-lisp.el
@@ -35,7 +35,10 @@
 (require 'prelude-lisp)
 
 ;; the SBCL configuration file is in Common Lisp
-(add-to-list 'auto-mode-alist '("\\.sbclrc$" . lisp-mode))
+(add-to-list 'auto-mode-alist '("\\.sbclrc\\'" . lisp-mode))
+
+;; Open files with .cl extension in lisp-mode
+(add-to-list 'auto-mode-alist '("\\.cl\\'" . lisp-mode))
 
 ;; Common Lisp support depends on SLIME being installed with Quicklisp
 (if (file-exists-p (expand-file-name "~/quicklisp/slime-helper.el"))