Hello Ferretters— In classic Ferret 7.5 this works: yes? let/units="m" oldvar = 777. yes? let/like=oldvar newvar = 666. yes? list newvar VARIABLE : 777. (m) 666.0 but in PyFerret 7.3 it does not: yes? let/units="m" oldvar = 777. yes? let/like=oldvar newvar = 666. **ERROR: unknown command qualifier: like=oldvar Is /like= removed in PyFerret, or is it a bug in version 7.3? —Marco