problem mounting a cifs share at boot in f15

[Gianluca Cecchi]

In /etc/fstab in both f14 and f15 I have this entry:

\\XXX\YYY\ZZZ /share 	cifs
credentials=/etc/filename,uid=500,workgroup=mydomain.dom 0   0

But in F14 it correctly mounts on boot, while in F15 it fails.
I get this in /var/log/messages:
Jul  6 10:38:42 mypc systemd[1]: share.mount mount process exited,
code=exited status=1
Jul  6 10:38:42 mypc systemd[1]: Job remote-fs.target/start failed
with result 'dependency'.
Jul  6 10:38:42 mypc systemd[1]: Unit share.mount entered failed state.

If, after boot, I run
mount /share
it mounts correctly...
What do I have to change?
Thanks in advance,
Gianluca