diff --git a/emacs/.emacs.d/init.el b/emacs/.emacs.d/init.el
index c923a46..07933cd 100644
--- a/emacs/.emacs.d/init.el
+++ b/emacs/.emacs.d/init.el
@@ -1302,6 +1302,7 @@ from myaethon2.core.decorators import (
 (add-hook 'write-file-hooks 'oni:write-file-func)
 (add-hook 'yas-global-mode-hook 'oni:yas-minor-mode-func)
 (add-hook 'ert-results-mode-hook (lambda () (setq truncate-lines nil)))
+(add-hook 'ruby-mode-hook (lambda () (setq-local fci-rule-column 80)))
 
 (oni:add-function-to-hooks #'flycheck-mode
   'perl-mode-hook 'rst-mode-hook 'rust-mode-hook 'sh-mode-hook