Empty array as PostgreSQL array column default value

Question

I have a defined an array field in postgresql 9.4 database:

character varying(64)[]

Can I have an empty array e.g. {} for default value of that

Answer 1

I tested both the accepted answer and the one from the comments. They both work.
I'll graduate the comments to an answer as it's my preferred syntax.

Answer 2

You need to use the explicit array initializer and cast that to the correct type:

ALTER TABLE public.accounts 
    ALTER COLUMN pwd_history SET DEFAULT array[]::varchar[];