diff --git a/.emacs.d/init.el b/.emacs.d/init.el
index 685f99f..d357cad 100644
--- a/.emacs.d/init.el
+++ b/.emacs.d/init.el
@@ -152,7 +152,8 @@
   (cat-mode :fetcher github :repo "ad1217/emacs-cat-mode")
   :config
   (cat-mode 1)
-  (define-key ibuffer-mode-map (kbd "c") 'cat-set-ibuffer))
+  (eval-after-load "ibuffer"
+    '(define-key ibuffer-mode-map (kbd "c") 'cat-set-ibuffer)))
 
 (use-package dired+ :quelpa
   :init