diff --git a/flake.nix b/flake.nix
index ba32138..117bc02 100644
--- a/flake.nix
+++ b/flake.nix
@@ -56,10 +56,11 @@
 
         devShell = pkgs.mkShell {
           buildInputs = with pkgs; [
-            pkgs.python3Packages.black
-            pkgs.python3Packages.isort
-            pkgs.python3Packages.mypy
-            python3
+            (python3.withPackages (ps: with ps; [
+              black
+              isort
+              mypy
+            ]))
           ];
 
           inherit (self.checks.${system}.pre-commit) shellHook;