# Theorem does not work after MikTeX update; no counter defined [duplicate]

The following stopped working after I updated MikTeX today:

 \documentclass{article}

\usepackage{amsthm}
\usepackage{hyperref}
\usepackage{cleveref}

\newtheorem{definition_}[equation]{Definition}

\begin{document}
\begin{definition_}[Something]
Something
\end{definition_}
\end{document}


The error is

No counter 'd' defined. \begin{definition_}


Am I doing something wrong, or is this is a bug somewhere? The document builds fine if I remove any of the three \usepackages, or remove [equation].