1099-R Says "Taxable Amount Not Determined" (2b), But It IS TAXABLE

So I entered a 1099-R that lists "Taxable Amount Not Determined" (2b) and TurboTax doesn't include this distribution as a taxable amount, but it should!

 

Do I just declare the correct amount in "Taxable Amount" (2a), even though it's actually left blank on the 1099-R?

 

Is there another way to include the correct value?

 

Thanks