diff --git a/README.org b/README.org
index 2dd9e19..1b3f9b9 100644
--- a/README.org
+++ b/README.org
@@ -622,15 +622,15 @@ verse and quote blocks are fontified using the `org-verse' and
 (defun set-buffer-variable-pitch-face ()
   "Set a variable width (proportional) font in current buffer."
   (interactive)
-  (let ((buffer-face-mode-face 'variable-pitch))
-    (buffer-face-mode)))
+  (setq-local buffer-face-mode-face 'variable-pitch)
+  (buffer-face-mode))
 
 ;; Use monospaced font faces in current buffer
 (defun set-buffer-fixed-pitch-face ()
   "Set a fixed width (monospace) font in current buffer."
   (interactive)
-  (let ((buffer-face-mode-face 'fixed-pitch))
-    (buffer-face-mode)))
+  (setq-local buffer-face-mode-face 'fixed-pitch)
+  (buffer-face-mode))
 
 (add-hook 'magit-mode-hook #'set-buffer-fixed-pitch-face)
 (add-hook 'prog-mode-hook #'set-buffer-fixed-pitch-face)