I am including some MATLAB code into my main document, using the listings package, which contains a unicode theta (θ). How can I render an actual unicode theta instead of using \theta. Here is a MWE:
\documentclass{article}
\usepackage{listings}
\
\begin{document}
\begin{lstlisting}
θ
\end{lstlisting}
\end{document}
This returns the error "Package inputenc Error: Invalid UTF-8 byte sequence."