diff --git a/flake.nix b/flake.nix
index 09a6eef..167f9f9 100644
--- a/flake.nix
+++ b/flake.nix
@@ -37,7 +37,7 @@
         config,
         ...
       }: let
-        pkg = self.packages.${pkgs.system}.default;
+        pkg = self.packages.${pkgs.stdenv.hostPlatform.system}.default;
         cfg = config.bluepython508.botc-mover;
       in {
         options.bluepython508.botc-mover = with lib; {