Is my job offer contingent on my minor?

I recently got a job offer from one of the big 4 accounting firms for tax accounting. I am a senior accounting major and an MIS minor. I will have 150 credits this summer with or without the minor, but, due to unforeseen circumstances with the way my university's courses are structured/scheduled, I will not be able to complete the minor by Summer 2018.

I have read through my offer contract several times and I do not really see anything that would suggest the offer can be rescinded if I drop the minor, but there is still the possibility that I am not comprehending the content properly. I plan on emailing the recruiter eventually, but, before I do that, I would like some more advice on the matter.