diff --git a/packages.nix b/packages.nix
index a0f978c..a9c6704 100644
--- a/packages.nix
+++ b/packages.nix
@@ -1,9 +1,5 @@
 { config, pkgs, lib, ... }:
 
-let
-  unstable = import <nixos-unstable> { };
-in
-
 {
   nixpkgs.overlays = lib.singleton
   (self: super:
@@ -12,10 +8,11 @@ in
           roomId     = "!FsUSHSNMPMVTFFcvJo:maxwell.ydns.eu";
           authToken  = config.secrets.passwords.matrix;
         };
-      haskellPackages = super.haskellPackages.override
-        { overrides = hself: hsuper:
-            { inherit (unstable.haskellPackages) namecoin-update; };
-        };
+      haskellPackages = super.haskellPackages.extend (hself: hsuper:
+        { namecoin-update =  hself.callCabal2nix "namecoin-update" (builtins.fetchTarball {
+            url = "https://hackage.haskell.org/package/namecoin-update-0.2.3.0/namecoin-update-0.2.3.0.tar.gz";
+          }) {};
+        });
     });
 
   environment.systemPackages = with pkgs; [