# listings wrong syntax highlighting in perl - format specification

Perl uses '#' as an introduction for a comment, but also as a format specification. This produces problems in the syntax highlighting in the listings-package. How can I fix it?

\documentclass{article}
\usepackage{listings}
\usepackage{xcolor}
\begin{document}
\begin{lstlisting}
#this is a comment
my $n=89; #the "@###.####" is NOT a comment format OUT= @###.#####$n
.
\end{lstlisting}
\end{document}

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\documentclass{article}
\usepackage{listings}
\usepackage{xcolor}
\begin{document}

my $n=89; #the "@###.####" is NOT a comment format OUT= @###.#####$n

Perhaps basicstyle should be preferred to keywordstyle here. –  Jubobs Mar 7 at 11:06