diff --git a/lib/mksystem.nix b/lib/mksystem.nix
index c3c39a5..4355b2f 100644
--- a/lib/mksystem.nix
+++ b/lib/mksystem.nix
@@ -123,13 +123,16 @@ in
       ]
       ++ nixpkgs.lib.optionals darwin [
         inputs.nix-index-database.darwinModules.nix-index
-        {
+        ({pkgs, ...}: {
+          environment.systemPackages = with pkgs; [
+            coreutils
+          ];
           # auth sudo via fingerprint
           security.pam.services.sudo_local = {
             reattach = true;
             touchIdAuth = true;
           };
-        }
+        })
       ]
       ++ custom;
   }
diff --git a/nvim/lua/plugins/conform.lua b/nvim/lua/plugins/conform.lua
index 469df9b..a56e934 100644
--- a/nvim/lua/plugins/conform.lua
+++ b/nvim/lua/plugins/conform.lua
@@ -35,6 +35,9 @@ return {
 				},
 				csharpier = function()
 					return {
+						command = "csharpier",
+						args = { "format" },
+						stdin = true,
 						--- @diagnostic disable: param-type-mismatch
 						cwd = require("conform.util").root_file(function(name)
 							return name:match('.*%.sln$') or name:match('.*%.csproj$')