Classe « lettre » : comment élargir le champ « Vref » ?

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\documentclass[12pt,french,a4paper,origdate]{lettre}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[fulloldstyle, light, largesmallcaps]{kpfonts}
\usepackage{lipsum}
\usepackage{babel}
\begin{document}
\begin{letter}{Olaf Grossebaf\\Hameau de Solsac\\\classicstylenums{12330} \textsc{Salles-la-source}}
\tension{0}
\pagestyle{plain}
\name{Anthime}
\notelephone
\nofax
\Vref{N\up{o} de dossier :\\
AWB \classicstylenums{2016-56-A2}}
%\Nref{}
\opening{Cher ami,}
\lipsum[1]
\closing{Je te prie d'agr\'eer, cher Olaf, l'expression de ma consid\'eration distingu\'ee.}
\end{letter}
\end{document}
 
 
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