diff --git a/configuration.org b/configuration.org
index 77f3876..8f80099 100644
--- a/configuration.org
+++ b/configuration.org
@@ -2994,7 +2994,8 @@ Because that’s still my favourite language.
 ** ~systemd~, for editing systemd unit files
 
 #+begin_src emacs-lisp
-(use-package systemd)
+(use-package systemd
+  :mode ("\\.\\(?:automount\\|mount\\|path\\|s\\(?:ervice\\|lice\\|ocket\\)\\|t\\(?:arget\\|imer\\)\\|wants\\)\\'" . systemd-mode))
 #+end_src
 
 ** ~terraform-mode~