diff --git a/pkgs/tools/filesystems/btrfs-progs/default.nix b/pkgs/tools/filesystems/btrfs-progs/default.nix
index a1b9d2084fe..9d68d4fa272 100644
--- a/pkgs/tools/filesystems/btrfs-progs/default.nix
+++ b/pkgs/tools/filesystems/btrfs-progs/default.nix
@@ -23,9 +23,6 @@ stdenv.mkDerivation rec {
 
   buildInputs = [ acl attr e2fsprogs libuuid lzo python3 zlib zstd ] ++ lib.optionals stdenv.hostPlatform.isGnu [ udev ];
 
-  # for python cross-compiling
-  _PYTHON_HOST_PLATFORM = stdenv.hostPlatform.config;
-
   # gcc bug with -O1 on ARM with gcc 4.8
   # This should be fine on all platforms so apply universally
   postPatch = "sed -i s/-O1/-O2/ configure";