In order to identify population trends in Barbastella barbastellus in Poland we summarised results of long-term winter bat counts conducted between 1985 and 2004 in seven of the most important hibernacula of the species. The results show an upward trend in four of the sites while in the remaining four no trend was found. The numbers of barbastelles in Poland seem stable or even increasing. In Central Europe the species is not threatened as seriously as it is in Western Europe.