diff --git a/pkgs/tools/package-management/nix/default.nix b/pkgs/tools/package-management/nix/default.nix
index 5448c9f5ba3..c31062989e1 100644
--- a/pkgs/tools/package-management/nix/default.nix
+++ b/pkgs/tools/package-management/nix/default.nix
@@ -5,11 +5,11 @@
 }:
 
 stdenv.mkDerivation rec {
-  name = "nix-1.3";
+  name = "nix-1.4";
 
   src = fetchurl {
     url = "http://nixos.org/releases/nix/${name}/${name}.tar.xz";
-    sha256 = "32cba96df0e02d6627f5625a441fdd4ea0db718dd5bfd50044cdfd3c606d4852";
+    sha256 = "f400c7e9c935271b833055e4d6888ec15eb90ef92ee6521dc55f1501036dc9b2";
   };
 
   buildNativeInputs = [ perl pkgconfig ];
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 9c85aa47abb..d16d12367ca 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -8946,10 +8946,14 @@ let
     stateDir = config.nix.stateDir or "/nix/var";
   };
 
+  nixUnstable = nixStable;
+
+  /*
   nixUnstable = callPackage ../tools/package-management/nix/unstable.nix {
     storeDir = config.nix.storeDir or "/nix/store";
     stateDir = config.nix.stateDir or "/nix/var";
   };
+  */
 
   nut = callPackage ../applications/misc/nut { };