Including pdfpages in a revtex document rotates the page

Question

When using pdfpages with revtex, all pages in the original document change from portrait to landscape upon simply including the package via \usepackage{pdfpages}. This is a MWE illustrating the issue:

\documentclass{revtex4-1}
\usepackage{pdfpages}
\begin{document}
Some text
\end{document}

Here is an image:

This issue does not occur with \documentclass{article}.

Here is an image: