Samba4: Trying to strip out netbios is blowing up the package size

I thought it would be a good idea to strip out netbios from samba4 package because we have wsdd2 and I don't use it. But doing so with:

# CONFIG_SAMBA4_SERVER_NETBIOS is not set

is blowing up the package size to insane 70MB (compressed) compared to ~10MB normally. So is this expected or did I overlook sth.? The curious thing is that the amout of files/libs within the package is the same. But the filesize is inflated like crazy.