diff --git a/configuration.org b/configuration.org
index fd0f974..84edb60 100644
--- a/configuration.org
+++ b/configuration.org
@@ -649,35 +649,6 @@ line first.  Then jump to the actual end of the line."
         (message "File '%s' successfully removed" filename)))))
 #+END_SRC
 
-*** Allow reopening the previously closed file
-
-#+BEGIN_SRC emacs-lisp
-(defvar gpolonkai/last-killed-buffer-file-name
-  nil
-  "The last killed buffer.
-
-Used by `gpolonkai/save-killed-buffer-filename' and `gpolonkai/undo-buffer-kill'.")
-
-(defun gpolonkai/save-killed-buffer-filename ()
-  "Save the filename of the killed buffer in `gpolonkai/last-killed-buffer-file-name'."
-  (let ((filename (buffer-file-name)))
-   (unless filename
-    (setq gpolonkai/last-killed-buffer-file-name (buffer-file-name)))))
-
-(add-hook 'kill-buffer-hook 'gpolonkai/save-killed-buffer-filename)
-
-(defun gpolonkai/undo-buffer-kill ()
-  "Undo killing the last buffer.
-
-Esentially it visits the file again."
-  (interactive)
-  (if gpolonkai/last-killed-buffer-file-name
-      (progn
-        (find-file gpolonkai/last-killed-buffer-file-name)
-        (setq gpolonkai/last-killed-buffer-file-name nil))
-    (message "The buffer last killed didn’t visit a file.")))
-#+END_SRC
-
 *** Open this file as another user
 
 #+BEGIN_SRC emacs-lisp
@@ -3880,7 +3851,6 @@ directory.  It is available from [[http://plantuml.com/download][here]].
  ("C-d" . delete-current-buffer-file)
  ("|" . toggle-window-split)
  ("k" . kill-this-buffer)
- ("M-k" . gpolonkai/undo-buffer-kill)
  ("C-b" . bury-buffer)
  ("/" . repeat)
  :map isearch-mode-map