diff --git a/release-combined.nix b/release-combined.nix
index c7eaeac5d17..004dd1b250a 100644
--- a/release-combined.nix
+++ b/release-combined.nix
@@ -1,4 +1,11 @@
+{ nixpkgs, officialRelease }:
+
 {
   nixos = import ./release.nix;
-  nixpkgs = import <nixpkgs/pkgs/top-level/release.nix>;
+  nixpkgs =
+    import <nixpkgs/pkgs/top-level/release.nix> {
+      inherit nixpkgs officialRelease;
+      # Only do Linux builds.
+      supportedSystems = [ "x86_64-linux" "i686-linux" ];
+    };
 }