pg_dump out of shared memory

In using pg_dump to dump an existing postgres database, I get the
following:

pg_dump: WARNING: out of shared memory
pg_dump: attempt to lock table <table name> failed: ERROR: out of
shared memory
HINT: You may need to increase max_locks_per_transaction.

postgresql.conf just has the default of 1000 shared_buffers. The
database itself has thousands of tables, some of which have rows
numbering in the millions. Am I correct in thinking that, despite the
hint, it's more likely that I need to up the shared_buffers?

Or is it that pg_dump is an example of "clients that touch many
different tables in a single transaction" [from
http://www.postgresql.org/docs/7.4/static/runtime-config.html#RUNTIME-CONFIG-LOCKS]
and I actually ought to abide by the hint?

-tfo