diff --git a/pkgs/tools/package-management/nix/default.nix b/pkgs/tools/package-management/nix/default.nix
index 31186fb07e3..5295591af29 100644
--- a/pkgs/tools/package-management/nix/default.nix
+++ b/pkgs/tools/package-management/nix/default.nix
@@ -147,12 +147,12 @@ in rec {
 
   nixUnstable = (lib.lowPrio (common rec {
     name = "nix-1.12${suffix}";
-    suffix = "pre5308_2f21d522";
+    suffix = "pre5344_eba840c8";
     src = fetchFromGitHub {
       owner = "NixOS";
       repo = "nix";
-      rev = "2f21d522c28b1e902bd7f0b5b9e7523975102d81";
-      sha256 = "1r3jxz0ydnlxp4b3ggxjgx1q9dv7jyfjm8w1srqjanzn944wnmi9";
+      rev = "eba840c8a13b465ace90172ff76a0db2899ab11b";
+      sha256 = "08yrzlmshg854w5pwq8af634wic91h7k55fs51i55dyxpw4wpxk7";
     };
     fromGit = true;
   })) // { perl-bindings = perl-bindings { nix = nixUnstable; }; };