[texhax] lstlisting frame from listings package too large

[Daniel Greenhoe]

When I use the frame=single option in the lstlisting environment from
the listings package, the frame produced extends outside the text area
of the page, on both the left and right sides. One hack solution is to
put the whole thing inside a minipage environment. However, is there a
"better" solution? Here is a minimal example (see also attachments):

\documentclass[oneside]{book}
%
\usepackage{geometry}
\geometry{showframe}
\usepackage{listings}
\begin{document}%

\begin{lstlisting}[frame=single]
  x=1
  x=2
  x=3
\end{lstlisting}

\begin{minipage}{50mm}
\begin{lstlisting}[frame=single]
  x=1
  x=2
  x=3
\end{lstlisting}
\end{minipage}
\end{document}%

Many thanks in advance,
Dan
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