Debian ignores static IPv6 configuration

Finally I solved my problem through changing the order of my entries in my /etc/network/interfaces file. Now it looks like that:

auto eth1
iface eth1 inet static
    address 10.1.0.10/16
    gateway 10.1.0.1
iface eth1 inet6 static
    address fd01::10/64
    gateway fd01::1

auto eth0
iface eth0 inet dhcp
iface eth0 inet6 dhcp

If the static entries are configured first, everything works fine.