\autoref{pro:label} does not produce Proposition in name, only counter

[proafxin]

\begin{proposition}\label{pro:char-not-one}
A test proposition.
\end{proposition}
\autoref{pro:char-not-one}

Produces 1.1 rather than Proposition 1.1. Have tried including \newcommand{\propositionautorefname}{Proposition} but same output.