diff --git a/pkgs/wsl-ssh-agent-forward/default.nix b/pkgs/wsl-ssh-agent-forward/default.nix
index 1ca33c2..cdd252a 100644
--- a/pkgs/wsl-ssh-agent-forward/default.nix
+++ b/pkgs/wsl-ssh-agent-forward/default.nix
@@ -5,7 +5,17 @@ stdenv.mkDerivation rec {
   version = "0.1";
   src = ./wsl-ssh-agent-forward.sh;
   nativeBuildInputs = [pkgs.makeWrapper];
-  phases = ["installPhase" ];
+  # phases = ["installPhase" ];
+    unpackCmd = ''
+      # $curSrc is the variable that contains the path to our source.
+      mkdir wsl-ssh-agent-forward-src
+
+      # We rename the file here, because when nix adds files to the
+      # store it adds a hash, which obviously we don't want for our
+      # shell script.
+      cp $curSrc wsl-ssh-agent-forward-src/wsl-ssh-agent-forward.sh
+    '';
+
   installPhase = ''
   install -Dm755 wsl-ssh-agent-forward.sh $out/bin/wsl-ssh-agent-forward.sh
   wrapProgram $out/bin/wsl-ssh-agent-forward.sh --prefix PATH : $out/bin