diff --git a/flake.nix b/flake.nix
index 522c76a..d522a96 100644
--- a/flake.nix
+++ b/flake.nix
@@ -70,20 +70,27 @@
         };
       });
 
-      checks = forAllSystems (pkgs: {
-        default = pkgs.callPackage ./nix/test.nix {
-          culr = self.packages.${pkgs.system}.tests;
-          inherit version;
-        };
-      });
+      checks = forAllSystems (
+        pkgs:
+        let
+          system = pkgs.stdenv.hostPlatform.system;
+        in
+        {
+          default = pkgs.callPackage ./nix/test.nix {
+            culr = self.packages.${system}.tests;
+            inherit version;
+          };
+        }
+      );
 
       packages = forAllSystems (
         pkgs:
         let
           minimal = (deps pkgs).minimal;
+          system = pkgs.stdenv.hostPlatform.system;
         in
         {
-          culr = self.packages.${pkgs.system}.default;
+          culr = self.packages.${system}.default;
           default = pkgs.ocamlPackages.callPackage ./nix/default.nix {
             ocaml-deps = minimal;
             inherit version;
@@ -104,9 +111,12 @@
 
       nixosModules.culr =
         { pkgs, ... }:
+        let
+          system = pkgs.stdenv.hostPlatform.system;
+        in
         {
           imports = [ ./nix/module.nix ];
-          programs.culr.package = self.packages.${pkgs.system}.culr;
+          programs.culr.package = self.packages.${system}.culr;
         };
 
     };