diff --git a/README.org b/README.org
index 6e21c0d..1873af7 100644
--- a/README.org
+++ b/README.org
@@ -2775,16 +2775,18 @@ Listing [[lst:configure-format-all]]:
   ;; https://ianyepan.github.io/posts/format-all/
   ;; https://jamesaimonetti.com/posts/formatting-tangled-output-in-org-mode/
   (when (and (ensure-package-installation 'format-all)
-             (fboundp 'format-all-ensure-formatter))
-    (add-hook 'prog-mode-hook #'format-all-ensure-formatter)
-    (add-hook
-     'org-babel-post-tangle-hook
-     (defun format-all-org-babel-post-tangle ()
-       (when (derived-mode-p 'python-mode)
-         (setq-local format-all-formatters '(("Python" black)))
-         (format-all-buffer)
-         (save-buffer)
-         (message "Saved reformatted tangled buffer `%s'" (buffer-file-name))))))
+             (autoload 'format-all-ensure-formatter "format-all"))
+    (with-eval-after-load 'prog-mode
+      (add-hook 'prog-mode-hook #'format-all-ensure-formatter))
+    (with-eval-after-load 'ob-tangle
+      (add-hook
+       'org-babel-post-tangle-hook
+       (defun format-all-org-babel-post-tangle ()
+         (when (derived-mode-p 'python-mode)
+           (setq-local format-all-formatters '(("Python" black)))
+           (format-all-buffer)
+           (save-buffer)
+           (message "Saved reformatted tangled buffer `%s'" (buffer-file-name)))))))
 #+end_src
 
 ** [[https://dept-info.labri.fr/~strandh/Teaching/PFS/Common/Strandh-Tutorial/Dir-symbolic.html][Common Lisp programming]]