How to get noitemsep with etaremune?

I have a document with lots of

begin{enumerate}[noitemsep]
   item ...
end{enumerate}

but want to change that to reverse numbering. Great, the etaremune (funny name 😉 ) package does this, but only almost: etaremune doesn’t mix with noitemsep:

    begin{etaremune}[noitemsep]
       item ...
    end{etaremune}

throws the error

    ! Package xkeyval Error: `noitemsep' undefined in families `template'.

Any suggestions to reduce the itemsep in an etaremune environment?

    begin{etaremune}[itemsep=0pt]
       item ...
    end{etaremune}