Filed tax return under incorrect form (1040-EZ instead of 1040-NR) in 2015. Do I need to correct that to file 2017 tax return under Non-Resident Alien?

I accidently filed my federal tax return in 2015 uing 1040-EZ while I was a non-resident alien.
Now I was planning to file my tax return as non-resident alient (1040-NR through sprintax) for 2017 as I am still a non-alien resident
(based on IRS rules). Do I need to correct my 2015 tax return as well? And if yes, how to do that? Please help