How can I reset or lower the serial used in BIND DNS server's SOA record?

I use BIND as my DNS server at home. For my Start Of Authority (SOA record) I always use a serial in the recommended format > YYYYMMDD## where ## is the counter for changes on that day. Unfortunately I changed the serial and added 1 more digit by mistake. After updating the name-daemon, I couldn't revert this anymore. Is there a possible way to reset the serial / counter inside BIND's internal libraries?