# A parbox inside a textblock

I would like to have absolute positioning with centering vertical alignment. I am trying to achieve this by using a \parbox inside a \textblock (from textpos):

\documentclass{article}
\usepackage[absolute,overlay,showboxes]{textpos}
\begin{document}
\setlength{\fboxsep}{0pt}
\begin{textblock*}{1in}(1in,1in)\noindent
\fbox{\parbox[c][1in][c]{1in}{Hallo}}
\end{textblock*}
\end{document}


However, it the widths of the textblock and the parbox do not match. Does anybody know where this unwanted extra spacing comes from and how to remove it?

\documentclass{article}