Cleveref produces incorrect labels when I cross-reference theorem-like environments

Question

If I set the counter of corollaries to follow theorem, cleveref incorrectly uses the label theorem in the text, rather than corollary. How can I correct this?

Minimum working example:

\documentclass{article}

\usepackage{amsthm}
\newtheorem{theorem}{Theorem}
\newtheorem{corollary}[theorem]{Corollary}
% \newtheorem{corollary}{Corollary}    % This works

\usepackage{cleveref}


\begin{document}

\begin{theorem}  \label{thm1}
    Theorem level result.
\end{theorem}

\begin{corollary}  \label{cor1}
    Corollary of \cref{thm1}.
\end{corollary}

Reference to \cref{cor1}.

\end{document}

Answer 1

You need to load the cleveref package right before issuing the \newtheorem directives.

This is discussed in section 14.1 of the user guide of the cleveref package [highlighting added]: