I submitted my resume to a prospective employer where I combined two similar positions I held at a university. Both positions were full time lab scientist roles, but they were in two different labs that I worked for 1 year each with no gap in between. I did not lie about my duties or anything else on my resume, but I gave no indication that they were separate positions. The resume was the only document I submitted (there was no electronic submission process that asked for my job history).
I realize this was an extremely silly mistake to make. I will be having an in person interview soon and I'm wondering what is the best way to rectify this. From a hiring manager's perspective, would this be a deal-breaker?