diff --git a/flake.nix b/flake.nix
index 44f34c5..afe5d35 100644
--- a/flake.nix
+++ b/flake.nix
@@ -26,7 +26,7 @@
 
     nixosModules = {
       default = { lib, pkgs, config, ... }: let
-        sso-bsn = self.packages.${pkgs.system}.default;
+        sso-bsn = self.packages.${pkgs.stdenv.hostPlatform.system}.default;
         gen-secret = pkgs.writeShellScript "gen-secret" ''
           (umask 077; [ -f $1/$2 ] || ${pkgs.coreutils}/bin/head -c 128 /dev/urandom | ${pkgs.coreutils}/bin/base64 -w0 > $1/$2)
         '';
diff --git a/shell.nix b/shell.nix
index d130820..9e87c73 100644
--- a/shell.nix
+++ b/shell.nix
@@ -10,8 +10,8 @@
 mkShell {
   packages =
     [elixir elixir-ls sqlite-interactive]
-    ++ lib.lists.optional (pkgs.system == "x86_64-linux") inotify-tools
-    ++ lib.lists.optionals (pkgs.system == "aarch64-darwin") (with pkgs.darwin.apple_sdk.frameworks; [
+    ++ lib.lists.optional (pkgs.stdenv.hostPlatform.system == "x86_64-linux") inotify-tools
+    ++ lib.lists.optionals (pkgs.stdenv.hostPlatform.system == "aarch64-darwin") (with pkgs.darwin.apple_sdk.frameworks; [
       CoreFoundation
       CoreServices
     ]);