diff --git a/pkgs/top-level/release-small.nix b/pkgs/top-level/release-small.nix
index faefdc5a0c3a..0fa311746b12 100644
--- a/pkgs/top-level/release-small.nix
+++ b/pkgs/top-level/release-small.nix
@@ -1,19 +1,19 @@
 /* A small release file, with few packages to be built.  The aim is to reduce
-   the load on Hydra when testing the `stdenv-updates' branch.
+   the load on Hydra when testing the `stdenv-updates' branch. */
 
+{ nixpkgs ? { outPath = (import ./all-packages.nix {}).lib.cleanSource ../..; revCount = 1234; shortRev = "abcdef"; }
+}:
 
-   This file will be evaluated by hydra with a call like this:
-   hydra_eval_jobs --gc-roots-dir \
-     /nix/var/nix/gcroots/per-user/hydra/hydra-roots --argstr \
-     system i686-linux --argstr system x86_64-linux --arg \
-     nixpkgs "{outPath = ./}" .... release.nix
-
-   Hydra can be installed with "nix-env -i hydra".  */
-with (import ./release-lib.nix);
+with import ./release-lib.nix {
+  supportedSystems = [ "x86_64-linux" "i686-linux" "x86_64-darwin" "x86_64-freebsd" "i686-freebsd" ];
+};
 
 {
 
-  tarball = import ./make-tarball.nix;
+  tarball = import ./make-tarball.nix {
+    inherit nixpkgs;
+    officialRelease = false;
+  };
 
 } // (mapTestOn (rec {