Should my grade be Changed?

My professor defined grades as: A = 90+, B=80 - 89, C=70-79 and so on and he doesn't have a round-up policy in his syllabus. I got a cumulative score of 89.7 in his course but he counted it as 89 (ignoring the fraction). Since his grades are defined on integer boundaries, I think he should have used rounding to calculate my integer score and use that to calculate the grade, which would have been a 90 (hence an A). Am I right?