Problem with dumping bloom extension

If a database with the bloom extension installed is dumped and restored, there's an error with the access method creation:

createdb bloomtest

psql -c 'CREATE EXTENSION bloom;' bloomtest

pg_dump -d bloomtest > ~/tmp/bloom.sql

createdb bloomtest2

psql -d bloomtest2 -f ~/tmp/bloom.sql

The output of the last command produces:

"psql:/home/thom/tmp/bloom.sql:48: ERROR:  access method "bloom" already exists"

So pg_dump shouldn't be dumping this access method as it's part of the extension.