How to properly report matching shares from ESPP

My employer provided matching shares as part of an ESPP (non-qualified I believe and will confirm tomorrow).  Purchases were made with post-tax payroll deductions at no discount  On the 1099-B, they are reporting the cost basis as zero.  Taxes were withheld when sold and is reported as income on W2.

 

I have cost basis information for all purchases and dividends, but the 1099-B shows the cost basis as zero for all matching shares.  Is this correct (since I did not actually pay for those shares) or should I calculate the cost basis for those shares and use my calculated cost basis in turbo tax?