Whoops, kilo- prefix should stay in lowercase after all (see the discussion at [1]). You can add another commit [2] when making the patch to fix this little issue.
[1] https://github.com/mate-desktop/mate-netspeed/pull/28 [2] https://github.com/mate-desktop/mate-netspeed/commit/908f9315bfb5a58798ab049d603cfeb7435ae6e7
