diff --git a/default.nix b/default.nix
index 66d4d1f..50c85bc 100644
--- a/default.nix
+++ b/default.nix
@@ -1,5 +1,7 @@
 { nixpkgs ? <nixpkgs> }:
 import nixpkgs {
+  # docker images run on Linux
+  system = "x86_64-linux";
   config = {};
   overlays = [
     (import ./overlay.nix)