diff --git a/ci-root.nix b/ci-root.nix
index 4003999ca9..0fd3e096cd 100644
--- a/ci-root.nix
+++ b/ci-root.nix
@@ -2,8 +2,9 @@
 #
 # SPDX-License-Identifier: Apache-2.0
 
+{ system ? builtins.currentSystem, ... }:
 let
-  depot = (import ./default.nix {});
+  depot = (import ./default.nix { inherit system; });
   pkgs = depot.third_party.nixpkgs;
   lib = pkgs.lib;
   prefixAttrs = prefix: lib.mapAttrsToList (name: value: { name = "${prefix}-${name}"; path = value; });
diff --git a/default.nix b/default.nix
index 608cd1f314..c9468c535f 100644
--- a/default.nix
+++ b/default.nix
@@ -2,12 +2,12 @@
 #
 # SPDX-License-Identifier: Apache-2.0
 
-{ ... }:
+{ system ? builtins.currentSystem, ... }:
 
 let
   fix = f: let x = f x; in x;
   config = depot: {
-    inherit depot;
+    inherit depot system;
     pkgs = depot.third_party.nixpkgs;
   };
 in fix (self:
diff --git a/third_party/default.nix b/third_party/default.nix
index 93b93e5f76..d7923c0f76 100644
--- a/third_party/default.nix
+++ b/third_party/default.nix
@@ -2,7 +2,7 @@
 #
 # SPDX-License-Identifier: Apache-2.0
 
-{ depot, ... }@ch:
+{ depot, system, ... }@ch:
 let
   nixpkgsConfig = {
     allowUnfree = true;
@@ -15,6 +15,7 @@ let
     };
   };
   nixpkgs = import ./nixpkgs {
+    inherit system;
     config = nixpkgsConfig;
   };
   crate2nixSrc = nixpkgs.fetchFromGitHub {