In ant1.3 you can specify the prefix ( for war, zip, etc ), that doesn't seem to work anymore ( since <fileset> will create a simple filest, without the prefix attribute ). If we create a ZipFileSet instead of FileSet everything works again. git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@269436 13f79535-47bb-0310-9956-ffa450edef68master