diff --git a/config.org b/config.org
index e02b23b..c2cd1da 100644
--- a/config.org
+++ b/config.org
@@ -62,9 +62,9 @@
 
    #+begin_src emacs-lisp
      (defun cut-at (delimeter string)
-       (substring string 0 (string-search delimeter string)))
+       (substring string 0 (seq-position string delimeter)))
 
-     (defvar hostname (cut-at "." (system-name)))
+     (defvar hostname (cut-at ?. (system-name)))
    #+end_src
 
 * Emacs Server