diff --git a/machines/sirius/configuration.nix b/machines/sirius/configuration.nix
index f915bfb..15724b0 100644
--- a/machines/sirius/configuration.nix
+++ b/machines/sirius/configuration.nix
@@ -21,6 +21,9 @@
   nixpkgs.hostPlatform = {
     system = "aarch64-linux";
   };
+  nixpkgs.buildPlatform = {
+    system = "x86_64-linux";
+  };
 
   system.stateVersion = "25.11";