Elsarticle frontmatter corresponding author

Elsarticle frontmatter corresponding author

I believe I have followed the template exactly but as this following MWE shows I am getting an asterisk on both authors and not just the corresponding author. Do I have something in the wrong order somewhere?
\documentclass[preprint,12pt]{elsarticle}

\begin{document}

\begin{frontmatter}

\title{Title}

\author{Author One\corref{cor1}\fnref{fn1}}
\ead{email@uni.edu}
\cortext[cor1]{Corresponding author}
\fntext[fn1]{Student}

\author{Author Two\fnref{fn2}}
\ead{email2@uni.edu}
\fntext[fn2]{Lecturer}

\address{Address Here}

\begin{abstract}
Abstract abstract abstract
\end{abstract}

\end{frontmatter}

\section{Section1}
Start typing...

\end{document}
Thanks