diff --git a/pkgs/by-name/lu/luarocks-packages-updater/package.nix b/pkgs/by-name/lu/luarocks-packages-updater/package.nix
index d597834c7bc0..1f799449c282 100644
--- a/pkgs/by-name/lu/luarocks-packages-updater/package.nix
+++ b/pkgs/by-name/lu/luarocks-packages-updater/package.nix
@@ -1,5 +1,6 @@
 {
   nix,
+  nixfmt,
   makeWrapper,
   python3Packages,
   lib,
@@ -15,6 +16,7 @@ let
 
   path = lib.makeBinPath [
     nix
+    nixfmt
     nix-prefetch-scripts
     luarocks-nix
     lua5_1
diff --git a/pkgs/by-name/lu/luarocks-packages-updater/updater.py b/pkgs/by-name/lu/luarocks-packages-updater/updater.py
index 8b70d01d41b0..2d9accce0351 100755
--- a/pkgs/by-name/lu/luarocks-packages-updater/updater.py
+++ b/pkgs/by-name/lu/luarocks-packages-updater/updater.py
@@ -161,8 +161,8 @@ class LuaEditor(nixpkgs_plugin_update.Editor):
 
         print(f"updated {outfilename}")
 
-        # Format the generated file with nix fmt
-        subprocess.run(["nix", "fmt", outfilename], check=True)
+        # Format the generated file with nixfmt
+        subprocess.run(["nixfmt", outfilename], check=True)
 
     @property
     def attr_path(self):