This pie is not as sweet as some. I don't like fruit pies sickeningly sweet (but just a tad on the tart side), but if you like yours sweeter, just increase the sugar. You might also want to consider your berries before adding the sugar- taste one first and see. Early season ones are often not as sweet and may need a bit more sugar. Be sure to watch the crust on your pie and cover it with foil or a guard if it starts to brown excessively.