Use of ase convert from the command line

Hi, I’m trying to use ase to convert a .cif unit cell into a lammps data file. Using:
ase -T convert in.cif out.data -o lammps-data --write-args units=real

But I’m getting an error:
NameError: name ‘real’ is not defined

According to the ASE docs relating to writing Lammps data files, I should be able to specify real units and full atom style but the --write-args flag doesn’t recognise either… any ideas?