diff --git a/nixos/release-combined.nix b/nixos/release-combined.nix
index 15b5b2b8b7b..8a62bce80a2 100644
--- a/nixos/release-combined.nix
+++ b/nixos/release-combined.nix
@@ -1,6 +1,7 @@
 { nixpkgs ? { outPath = ./..; revCount = 5678; shortRev = "gfedcba"; }
 , officialRelease ? false
 , stableBranch ? false
+, supportedSystems ? [ "x86_64-linux" "i686-linux" ]
 }:
 
 let
@@ -23,10 +24,8 @@ in rec {
   });
 
   nixpkgs = builtins.removeAttrs (removeMaintainers (import ../pkgs/top-level/release.nix {
-    inherit officialRelease;
+    inherit officialRelease supportedSystems;
     nixpkgs = nixpkgsSrc;
-    # Only do Linux builds.
-    supportedSystems = [ "x86_64-linux" "i686-linux" ];
   })) [ "unstable" ];
 
   tested = pkgs.releaseTools.aggregate {
diff --git a/nixos/release.nix b/nixos/release.nix
index 4a10ff39ed0..81a5f06f403 100644
--- a/nixos/release.nix
+++ b/nixos/release.nix
@@ -1,6 +1,7 @@
 { nixpkgs ? { outPath = ./..; revCount = 5678; shortRev = "gfedcba"; }
 , officialRelease ? false
 , stableBranch ? false
+, supportedSystems ? [ "x86_64-linux" "i686-linux" ]
 }:
 
 let
@@ -10,9 +11,7 @@ let
     if officialRelease then ""
     else (if stableBranch then "." else "pre") + "${toString nixpkgs.revCount}.${nixpkgs.shortRev}";
 
-  systems = [ "x86_64-linux" "i686-linux" ];
-
-  forAllSystems = pkgs.lib.genAttrs systems;
+  forAllSystems = pkgs.lib.genAttrs supportedSystems;
 
   callTest = fn: args: forAllSystems (system: import fn ({ inherit system; } // args));