diff --git a/README.md b/README.md
index 447d031..22bca43 100644
--- a/README.md
+++ b/README.md
@@ -173,7 +173,7 @@ to your `~/.emacs`:
  'load-path
  (replace-regexp-in-string
   "\n" "/share/emacs/site-lisp"
-  (shell-command-to-string "opam config var prefix")))
+  (shell-command-to-string "opam var prefix")))
 
 ;; Automatically load utop.el
 (autoload 'utop "utop" "Toplevel for OCaml" t)