Lettrine in lettre class make a too large left margin

Explanations

When I use a lettrine command from lettrine package inside the letter environment with lettre class, so, the lettrine occur a big unwanted left margin.

MWE

documentclass{lettre}
usepackage{lettrine}


begin{document}

  begin{letter}{~}
    opening{Mister,}

    lettrine{H}{ello sir} lorem ipsum dolor sit amet et consectetur quia adipit erit et nunquam aeter 

    Lorem ipsum dolor sit amet
  end{letter}

end{document}

Rendering

Some tries

I try to use noindent before lettrine but it doesn’t have any effect.

Edit. It doesn’t work either with hspace{<negative value>}.

Question

How to avoid the big left-margin with a lettrine inside the lettre class?