Incorrect assessment year

While filing for the IT returns for the financial year 2009-10, someone had put the assessement year as 2009-10 (instead of 2010-11), which makes it filing for the previous year. 

Is there a way to get this rectified ? The attached Form-16, of course has the right information about the assessment year and all other data matches with that form-16.

Any help on this would be much appreciated.