Is money taken out of my paycheck by my employer for an HSA considered a TAXABLE employer contribution?

Each paycheck I had money deduced from my gross income by payroll to be sent to my HSA. That amount for the year is listed in box 12d of my W-2 with code W.

Now that I'm filing my taxes, TurboTax thinks that entire amount is a taxable employer contribution. Shouldn't this be a tax free employer contribution?