diff --git a/packages.nix b/packages.nix
index a1c7b5b..281803b 100644
--- a/packages.nix
+++ b/packages.nix
@@ -11,7 +11,10 @@ in {
   nixpkgs.config = {
     allowUnfree = true;
     packageOverrides = pkgs: {
-      pr64977 = import (fetchTarball "${nixpkgs-tars}7da8de19b1f394c92f27b8d953b85cfce1770427.tar.gz") {
+      pr64977 = import (pkgs.fetchzip {
+          url = "${nixpkgs-tars}7da8de19b1f394c92f27b8d953b85cfce1770427.zip";
+          sha256 = "1bc6lg8p8r8sw49vzprzkyvwvm9j8qndbdlj792djkqkvkrpzzka";
+        }) {
         config = config.nixpkgs.config;
       };
     };