diff --git a/pkgs/games/unnethack/default.nix b/pkgs/games/unnethack/default.nix
index ae32de2e771..ea0186323c0 100644
--- a/pkgs/games/unnethack/default.nix
+++ b/pkgs/games/unnethack/default.nix
@@ -20,6 +20,8 @@ stdenv.mkDerivation rec {
                      "--with-gamesdir=/tmp/unnethack"
                    ];
 
+  makeFlags = [ "GAMEPERM=744" ];
+
   postInstall = ''
     cp -r /tmp/unnethack $out/share/unnethack/profile
     mv $out/bin/unnethack $out/bin/.wrapped_unnethack