No, not for the total value, or at least you shouldn't be. You would be getting taxed for the gain on the stock (if any), which is determined by the purchase price and the sales price. The purchase price is how much the stock was previously included in income, and the sales price the amount the stock was cashed in for, regardless of the motive for cashing it in.
Chances are it will look something like this: In 2016, you received the RSUs and $10,000 was included in income. This year they vested, and were cashed in to pay taxes on RSUs included in income this year. The RSUs were sold for a total of 10,500 due to growth. You pay tax on $500, not on the entire amount.
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