\NUMBERstringnum does not work with Italian

[vincentb1]

Here is a minimal complete example of the issue:

\documentclass{minimal}
\usepackage[italian]{babel}
\usepackage{fmtcount}
\begin{document}
\NUMBERstringnum{10}
\end{document}

What I see in the log is the following:

! TeX capacity exceeded, sorry [input stack size=5000].
<argument> ...eserved@a *{\@printnumeroinparolef }
                                                  \reserved@a 
l.5 \NUMBERstringnum{10}

!  ==> Fatal error occurred, no output PDF file produced!