Sure. Why not. However, you will want to wait until original has been processed (refund received) before sending in amendment. 

I imagine this is going to be a quite common occurrence.  On a semi-related matter, I had a return with Form 2441 credits that I did not hit the residency box but fortunately they had enough tax so when it appeared as nonrefundable it was fully allowed.  I am not going to amend since it has no effect on tax.  But I would bet this is happening a lot. 

It would be nice if there was a diagnostic on both of these but once you miss it and realize it, you won't miss it again.

Do you ever miss the old days before computers when taxes were....well, simple?