A little snag on my way to Fedora 19

fedup refused to upgrade my Fedora 18 system to Fedora 19. The output from fedup was:

[coxa@thinky ~]$ sudo fedup-cli --network 19
setting up repos...
getting boot images...
.treeinfo                                                                                                                      | 1.1 kB  00:00:00     
setting up update...
Your system is already upgraded!
Finished. Nothing to do.

I had to run a clean operation first:

[coxa@thinky ~]$ sudo fedup-cli --clean
resetting bootloader config
removing boot images
removing downloaded packages
removing miscellaneous files

After that, the download process started!