diff --git a/nix/config/emacs/init.el b/nix/config/emacs/init.el
index bf38fa6..0f2ba83 100644
--- a/nix/config/emacs/init.el
+++ b/nix/config/emacs/init.el
@@ -17,7 +17,12 @@
   (setq aw-keys '(?a ?b ?c ?d ?e ?f ?g ?h ?i ?j)
         aw-dispatch-always nil))
 
-(use-package apheleia)
+(use-package apheleia
+  :config
+  (add-to-list 'apheleia-formatters
+               '(nixpkgs-fmt . ("nixpkgs-fmt")))
+  (add-to-list 'apheleia-mode-alist
+               '(nix-mode . nixpkgs-fmt)))
 
 (use-package autorevert
   :config