diff --git a/pkgs/misc/nix-unstable/default.nix b/pkgs/misc/nix-unstable/default.nix
index b4f736f755e8..c1ba972c101d 100644
--- a/pkgs/misc/nix-unstable/default.nix
+++ b/pkgs/misc/nix-unstable/default.nix
@@ -8,11 +8,11 @@ assert aterm != null && bdb != null && perl != null;
 # assert aterm.version >= 2.0
 
 stdenv.mkDerivation {
-  name = "nix-0.10pre6474";
+  name = "nix-0.10pre6593";
   builder = ./builder.sh;
   src = fetchurl {
-    url = http://nix.cs.uu.nl/dist/nix/nix-0.10pre6474/nix-0.10pre6474.tar.bz2;
-    md5 = "aed25ae83ada6012a3d924d3747b4c23";
+    url = http://nix.cs.uu.nl/dist/nix/nix-0.10pre6593/nix-0.10pre6593.tar.bz2;
+    md5 = "7aeb986b0803119891244f0ab936305d";
   };
   buildInputs = [aterm bdb perl curl];
   inherit storeDir stateDir aterm bdb;