QFile returns wrong file name after renaming

When using file.rename("foo.txt")then qDebug()<< file.fileName() should return "foo.txt".

...
if (!file.rename("new.txt"))

{ qDebug() << "Error renaming file: " << file.errorString(); return -1; }

qDebug() << "file name after rename = " << file.fileName();
...

It returns old file name