diff --git a/default.nix b/default.nix
index bdba0eaf07..a20e378428 100644
--- a/default.nix
+++ b/default.nix
@@ -1,3 +1,4 @@
-{ nixpkgs ? <nixpkgs>, overlays ? [], ... }@args: import nixpkgs {
+{ nixpkgs ? builtins.fetchTarball "https://github.com/lopsided98/nixpkgs/archive/nix-ros.tar.gz"
+, overlays ? [], ... }@args: import nixpkgs {
   overlays = [ (import ./overlay.nix) ] ++ overlays;
 } // args