diff --git a/pkgs/tools/package-management/nix/default.nix b/pkgs/tools/package-management/nix/default.nix
index 7caa2fc44fd7..e755507356d7 100644
--- a/pkgs/tools/package-management/nix/default.nix
+++ b/pkgs/tools/package-management/nix/default.nix
@@ -112,12 +112,12 @@ in rec {
 
   nixUnstable = lib.lowPrio (common rec {
     name = "nix-1.12${suffix}";
-    suffix = "pre5060_fa125b9";
+    suffix = "pre5073_1cf4801";
     src = fetchFromGitHub {
       owner = "NixOS";
       repo = "nix";
-      rev = "fa125b9b28bea25a4eeb4d39a71a481563127cb9";
-      sha256 = "1l7prlki3rjw3i119cizqqkpqg4p3hvym103x7hddimwpzwkw756";
+      rev = "1cf480110879ffc8aee94b4b75999da405b71d7c";
+      sha256 = "1iwpddz0yni7cz2g9asj6nmrwhaai3rhfmkq954hph8nx02c3l02";
     };
     fromGit = true;
   });