What is my cost basis on a return of capital on foreign ADR stock where 1099-B shows acquired and distributed the same date in the amount of $0.31?

On my 1099-B form, it says 0.10 Banco Bradesco (Ticker BBD), a foreign ADR stock, and the date acquired and sold/disposed are the same, with proceeds of $0.31.  The cost basis is blank and TurboTax requires an adjustment.  From looking at the history of transactions for this holding in my brokerage account, I've saved the info for this date where it states "return of capital." So what is my cost basis? $0.31? Thanks. This is the first time I've encountered proceeds as a return of capital.