Remove horizontal space incurred by \' in tabbing

Question

Consider the following code:

\documentclass{article}
\begin{document}
\begin{tabbing}
FOO\=\kill
FOO\>BAR\\  
\>O\'BAR\\  
\end{tabbing}
\end{document}

The output is

How to remove the space after "O" in the second line, moving this "O" to the right, i.e., to get

FOOBAR
  OBAR

?

This question is specific to tabbing (we all know how to achieve this result in other environments, say, tabular).

Answer 1

30 years of tex use and first time I have ever set this parameter:-)

\documentclass{article}
\begin{document}
\setlength\tabbingsep{0pt}
\begin{tabbing}
FOO\=\kill
FOO\>BAR\\  
\>O\'BAR\\  
\end{tabbing}
\end{document}