Hello, my citizenship interview is coming up ans I just noticed there was a mistake on my N-400 form. And I was wondering if this mistake is huge?

The fact that you checked off “yes” for the question of whether your spouse is a US citizen when you are single is something that you can straighten out at the time of your naturalization interview. The officer should go over the entire application with you and give you a chance to explain any discrepancies that he or she sees. Due to the limitations of the Lawyers.com Forums, Alan Lee, Esq.'s (the "Firm") participation in responding to questions posted herein does not constitute legal advice, nor legal representation of the person or entity posting a question. No Attorney/Client relationship is or shall be construed to be created hereby. The information provided herein by the Firm is general, and requires that the poster obtain specific legal advice from an attorney. The poster shall not rely upon the information provided herein as legal advice nor as the basis for making any decisions of legal consequence.