Tds on fixed deposit is 10%. what if i am under 20% bracket

Hello,

There is Fixed deposit whose interest is more than 10,000. So, the bank has deposited 10% TDS.
This is fine. But, the total income (salary + interest) falls under the 20% tax bracket. In this case, according to the calculations, the TDS depositied is not enough and the tax calculator (on the income tax website) says that more tax needs to be paid.

Is this right? Or am I missing something?
How can this be avoided in the future?

Thanks and Regards,
Gururaj