diff --git a/init.d/basics/global-variables.el b/init.d/basics/global-variables.el
index 41db5f8..4f6c202 100644
--- a/init.d/basics/global-variables.el
+++ b/init.d/basics/global-variables.el
@@ -1,6 +1,6 @@
 ;;; global-variables.el --- Set some global variables. -*- lexical-binding: t; -*-
 
-;; Time-stamp: <2020-12-03T08:37:05+0100>
+;; Time-stamp: <2020-12-05T10:45:47+0100>
 
 ;;; Commentary:
 ;; * Banish customizations.
@@ -53,10 +53,12 @@
             (defvar slow-computer nil)  ; Slow computers load fewer packages.
             (if (member (system-name) '("steuerbeamter" "azimuth" "localhost"))
                 (setq slow-computer t)) ; localhost is schnibble.
-            (defvar-local my/reformat-save t
+            (defcustom my/reformat-save t
               "Make changes to the buffer on save.
-If t, run `whitespace-cleanup', `clang-format-buffer' and so on.")
-            (put 'my/reformat-save 'safe-local-variable #'booleanp)))
+If t, run `whitespace-cleanup', `clang-format-buffer' and so on."
+              :type 'boolean
+              :safe #'booleanp
+              :local t)))
 
 (provide 'basics/global-variables)
 ;;; global-variables.el ends here