make-kpkg error

[ujr@physik.phy.tu-dresden.de (Ulf Jaenicke-Roessler)]

Hallo,

 yesterday I successfully compiled kernel 2.0.29 at home. Today I tried
 the same at work and it went wrong :( Both systems are equally configured
 regarding the relevant packages (dpkg 1.4.0.8, dpkg-deb 1.4.0.8, 
 kernel-package 3.19, don't know about others).

I did:
 make mrproper
 make config
 make-kpkg --zimage --revision work-1.0 \
 kernel_image kernel_source kernel_headers

zImage and modules are compiled correctly. Then after the modules were mv'ed
to tmp-image I get:

-------
cp arch/i386/boot/zImage \
                   debian/tmp-image/boot/vmlinuz-2.0.29
cp vmlinux debian/tmp-image/boot/vmlinux-2.0.29
cp System.map debian/tmp-image/boot/System.map-2.0.29
chmod 644 debian/tmp-image/boot/vmlinuz-2.0.29 \
                  debian/tmp-image/boot/vmlinux-2.0.29 \
		  debian/tmp-image/boot/System.map-2.0.29
dpkg-gencontrol -pkernel-image-2.0.29 -Pdebian/tmp-image/
chown -R root.root debian/tmp-image
dpkg --build debian/tmp-image ..
dpkg-deb - error: (upstream) version (`work') doesn't contain any digits
dpkg-deb: 1 errors in control file
make: *** [stamp-image] Error 2
-------

I think I did what I'm told in /usr/doc/kernel-package/README.
Mysteriously 'make-kpkg --zimage --revision work.1 buildpackage' runs ok.

Don't know if the information is sufficient to say what could be wrong.
Any idea? Thanks in advance,

 Ulf