I contributed and then performed a backdoor Roth in Feb '18 for '17 tax year. My broker will not give a 1099. How do I report my '17 tax year backdoor Roth w/o a 1099?

I contributed to my traditional IRA in Feb 2018 for the 2017 tax year. I then perform a backdoor Roth conversion on that contribution in 2018 again for the 2017 tax year. I talked to my broker and they said no 1099 R will be issued for that contribution/distribution. But, instead a 1099 R will be issued in 2019 for the 2018 tax year that will document my 2017 tax year contribution/distribution. My question is how do I report this 2017 tax year backdoor Roth conversion without a 1099 R for the 2017 tax year?