# Use upright lowercase greek with mathdesign

After looking at the isomath document, I am interested in the second way of implementing lowercase upright greeks. But it seems that this method does not work.

\documentclass{scrartcl}

\SetMathAlphabet{\mathbf}{normal}{OML}{mdput}{b}{n}

\begin{document}
$$\mathbf{\pi}\pi$$
\end{document}

And the result is