label completion in the \ref auctex macro

Using the auctex macro \ref I would excpect that the key completion
using TAB to offer all labels in the current document.

For example starting from this document:
\documentclass[a4paper]{article}

\begin{document}
\begin{figure}
  dfdsj
  \caption{eins}
  \label{fig:eins}
\end{figure}
\end{document}

using copy and paste:
\documentclass[a4paper]{article}

\begin{document}
\begin{figure}
  dfdsj
  \caption{eins}
  \label{fig:eins}
\end{figure}

\begin{figure}
  dfdsj
  \caption{zwei}
  \label{fig:zwei}
\end{figure}

\end{document}

Now, fig:zwei is not offered in the completion list.

Emacs  : GNU Emacs 22.0.50.36 (x86_64-unknown-linux-gnu, GTK+ Version 2.4.9)
 of 2005-03-15 on bridgekeeper
Package: AUCTeX CVS-5.489 (2005-03-15)

current state:
==============
(setq
 window-system 'x
 LaTeX-version "2e"
 TeX-style-path '("style/" "auto/" "/home/dept/scht/.TeX/style/"
		  "/usr/share/doc/.TeX/style/" "/usr/doc/.TeX/style/"
		  "/home/dept/scht/.TeX/style/" "/usr/share/doc/.TeX/style/"
		  "/usr/doc/.TeX/style/" "/home/dept/scht/.TeX/auto/"
		  "/usr/share/doc/.TeX/auto/" "/usr/doc/.TeX/auto/"
		  "/home/dept/scht/.TeX/auto/" "/usr/share/doc/.TeX/auto/"
		  "/usr/doc/.TeX/auto/"
		  "/import/xtra/emacs/RC/share/emacs/site-lisp/auctex/style/"
		  "/usr/local/share/emacs/site-lisp/auctex/auto/")
 TeX-auto-save t
 TeX-parse-self t
 TeX-master nil
 )