Alpha problem

OK so i been smashing nuke for the last 2 months and its wicked, but there are somethings i dont know that are probably simple fix but when you have an EXR image with no alpha, when i use a merge node with over, it of blends the layers together instead of A over B. Not sure how to solve this as my usual fix is > roto > premult the image.

Whats an easier way?

Cheers guys 🙂

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