MariaDB Slave Error - String is too long for MASTER_HOST

I'm attempting to replicate an AWS RDS instance with MariaDB. For those not familiar, RDS instances have extremely long DNS hostnames and cannot be accessed by their underlying IP address.

When it comes time to issue the "change master" command, I receive the following error:

String 'my rds dns name' is too long for MASTER_HOST (should be no longer than 60)

I can't figure out how to bypass this. Any ideas?

For the record, I have successfully done this before with non RDS machines. I'm not a complete noob :)