source block exported with tabs replacing spaces?

[Alan Schmitt <alan.schmitt@polytechnique.org>]

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Hello,

I'm working on a presentation and I noticed that some of my source
blocks have spaces exported as tabs. Here is an example:

 #+begin_src js :wrap center :results output :exports both
 console.log((![]+[])[+!+[]]+
             (![]+[])[!+[]+!+[]]+
             (![]+[])[+!+[]]+
             ([][[]]+[])[+!+[]])
 #+end_src

get exported to the following latex code
 \begin{minted}[frame=lines,fontsize=\scriptsize]{js}
console.log((![]+[])[+!+[]]+
	    (![]+[])[!+[]+!+[]]+
	    (![]+[])[+!+[]]+
	    ([][[]]+[])[+!+[]])
\end{minted}

(Note the tabs instead of the 8 spaces). I have `indent-tabs-mode' set
to nil in both the file and the exporter setting (I'm using the
asynchronous exporter with a specified file).

How can I tell org to preserve the spaces?

Thanks,

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