diff --git a/pkgs/overlays/unstable.nix b/pkgs/overlays/unstable.nix
index 9aa8f2c..f40c705 100644
--- a/pkgs/overlays/unstable.nix
+++ b/pkgs/overlays/unstable.nix
@@ -16,10 +16,10 @@ let
 
   nixpkgsRevision = (builtins.readFile "${unstablePkgsExprs}/.git-revision");
   unstablePkgsForNixpkgs = nixpkgs: import unstablePkgsExprs {
-    # localSystem -> pkgs.stdenv.hostPlatform or pkgs.stdenv.hostPlatform ???
-    localSystem = nixpkgs.stdenv.hostPlatform;
-    # crossSystem -> nixpkgs.stdenv.targetPlatform
-    crossSystem = nixpkgs.stdenv.targetPlatform;
+    # localSystem -> pkgs.stdenv.buildPlatform
+    localSystem = nixpkgs.stdenv.buildPlatform;
+    # crossSystem -> pkgs.stdenv.hostPlatform or pkgs.stdenv.targetPlatform ??
+    crossSystem = nixpkgs.stdenv.hostPlatform;
     # config -> pkgs.config
     config = nixpkgs.config;
     # overlays -> partial of pkgs.overlays