# Doublespacing from the setspace package stretches matrices?

I'm writing an article which is doublespaced throughout. Normal math mode looks fine, but in any instance of the pmatrix environment, the parentheses of the matrix become stretched out. Roughly, I have something like

\documentclass{article}
\usepackage{amsmath}
\usepackage{setspace}
\doublespace

\begin{document}

$\begin{pmatrix} a & b \end{pmatrix}$

\end{document}


The parentheses then stretch much wider than the matrix entries a and b and it looks bad to me. How can I make these matrices format normally, while still doublespacing throughout the document?