diff --git a/third_party/nix/pkgs/python3/default.nix b/third_party/nix/pkgs/python3/default.nix
new file mode 100644
index 0000000..3102b88
--- /dev/null
+++ b/third_party/nix/pkgs/python3/default.nix
@@ -0,0 +1,10 @@
+{ pkgs }: with pkgs;
+# Only override for our actual build
+if (!stdenv.hostPlatform.isStatic) then python3Minimal else
+python3Minimal.overrideAttrs (old: {
+  # Revert "fixup" which hardcodes a nix path.
+  postPatch = old.postPatch + ''
+    substituteInPlace Lib/subprocess.py \
+      --replace-fail "'${bashNonInteractive}/bin/sh'" "'/bin/sh'"
+  '';
+})