Amending a return to remove dependent for stimulus.

My adult son earned taxable income in 2019 and we filed his income taxes before our own. In the question about if he can be a dependent on another persons tax form, we checked yes but that he wouldn't be. As it turns out, when we filed ours, we learned he couldn't be a dependent on ours anyway. Fast forward and the stimulus states that adult dependents can't receive anything. I looked at his return and despite us saying he wouldn't be claimed as a dependent, the box on his form is checked saying he can be claimed as a dependent. Should we amend his return to state that he can't be claimed as a dependent? Thanks in advance for the education.