diff --git a/mode-customizations/ruby-mode.el b/mode-customizations/ruby-mode.el
index 817d125..418a070 100644
--- a/mode-customizations/ruby-mode.el
+++ b/mode-customizations/ruby-mode.el
@@ -12,6 +12,7 @@
 (add-to-list 'auto-mode-alist '("Rakefile" . ruby-mode))
 (add-to-list 'auto-mode-alist '("Vagrantfile" . ruby-mode))
 (add-to-list 'auto-mode-alist '("Cheffile" . ruby-mode))
+(add-to-list 'auto-mode-alist '("Berksfile" . ruby-mode))
 
 (defun customizations-for-ruby-mode ()
   (interactive)