diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 758de09eed9..c11561b7c36 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -10347,6 +10347,7 @@ in
     inherit (darwin) apple_sdk cf-private libobjc;
     bootstrap_cmds = if stdenv.isDarwin then darwin.bootstrap_cmds else null;
     mesa = mesa_noglu;
+    python = python2; # Incompatible with Python 3x
     udev = if stdenv.isLinux then udev else null;
     libdrm = if stdenv.isLinux then libdrm else null;
     fglrxCompat = config.xorg.fglrxCompat or false; # `config` because we have no `xorg.override`