# Standard single quotes for code in listings [duplicate]

In my code, I have curved quotes (see screenshot). Can I replace them with vertical quotes?

This is my formatting code:

\lstset{%
% General design
backgroundcolor=\color{lightgray},
basicstyle={\small\ttfamily},
frame=l,
% Code design
identifierstyle=\color{black},
keywordstyle=\color{blue}\bfseries,
ndkeywordstyle=\color{greenCode}\bfseries,
stringstyle=\color{ocherCode}\ttfamily,
% Code
language={JavaScript},
tabsize=2,
showtabs=false,
showspaces=false,
showstringspaces=false,
extendedchars=true,
breaklines=true,
captionpos=b,
% line-numbers
xleftmargin={0.75cm},
numbers=left,
stepnumber=1,
firstnumber=1,
numberfirstline=true,
}

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## marked as duplicate by Marco Daniel, Claudio Fiandrino, Kurt, Stefan Kottwitz♦Feb 9 '13 at 15:55

Have you tried \usepackage{upquote}? – G. Poore Feb 6 '13 at 4:18
It would be useful to put a full minimal working example up to play with, it looks like you've included more that listings to get this working. – Nathanael Farley Feb 6 '13 at 9:48

The use of upquote solves the problem:
\usepackage{upquote}