diff --git a/pkgs/tools/package-management/nix/unstable.nix b/pkgs/tools/package-management/nix/unstable.nix
index bfcf3697d8a..428f1325bc8 100644
--- a/pkgs/tools/package-management/nix/unstable.nix
+++ b/pkgs/tools/package-management/nix/unstable.nix
@@ -3,14 +3,14 @@
 , stateDir ? "/nix/var"
 }:
 
-let version = "0.12pre10798"; in
+let version = "0.12pre11304"; in
 
 stdenv.mkDerivation {
   name = "nix-${version}";
   
   src = fetchurl {
-    url = "http://nix.cs.uu.nl/dist/nix/nix-${version}/nix-${version}.tar.bz2";
-    md5 = "1f3d0a72c9bf1297c2daa32e601bde82";
+    url = "http://nixos.org/releases/nix/nix-${version}-6hxl2ybs/nix-${version}.tar.bz2";
+    sha256 = "8f33687ed70d4e1453cf62c0a9c5010cc49ed787794320ef94e9ead740fd042b";
   };
 
   buildInputs = [perl curl openssl];