diff --git a/pkgs/nixpkgs-pinned.nix b/pkgs/nixpkgs-pinned.nix
index 1ee64cd..bc10fd7 100644
--- a/pkgs/nixpkgs-pinned.nix
+++ b/pkgs/nixpkgs-pinned.nix
@@ -1,12 +1,7 @@
+let
+  fetch = rev: builtins.fetchTarball "https://github.com/nixos/nixpkgs-channels/archive/${rev}.tar.gz";
+in
 {
-  nixpkgs = builtins.fetchGit {
-    url = "https://github.com/nixos/nixpkgs-channels";
-    ref = "nixos-19.03";
-    rev = "e6ad5e75f3bfaab5e7b7f0f128bf13d534879e65";
-  };
-  nixpkgs-unstable = builtins.fetchGit {
-    url = "https://github.com/nixos/nixpkgs-channels";
-    ref = "nixos-unstable";
-    rev = "765a71f15025ce78024bae3dc4a92bd2be3a8fbf";
-  };
+  nixpkgs = fetch "e6ad5e75f3bfaab5e7b7f0f128bf13d534879e65";
+  nixpkgs-unstable = fetch "765a71f15025ce78024bae3dc4a92bd2be3a8fbf";
 }