diff --git a/modules/lang/nix/doctor.el b/modules/lang/nix/doctor.el
index 043ce4c8c..fe1b18b35 100644
--- a/modules/lang/nix/doctor.el
+++ b/modules/lang/nix/doctor.el
@@ -4,8 +4,9 @@
 (unless (executable-find "nix")
   (warn! "Couldn't find the nix package manager. nix-mode won't work."))
 
-(unless (executable-find "nixfmt")
-  (warn! "Couldn't find nixfmt. nix-format-buffer won't work."))
+(when (require 'nix-mode nil t)
+  (unless (executable-find nix-nixfmt-bin)
+    (warn! (concat "Couldn't find " nix-nixfmt-bin ". nix-format-buffer won't work."))))
 
 (assert! (or (not (modulep! +tree-sitter))
              (modulep! :tools tree-sitter))