Default value of serial fields changes after restore

Today I found a strange behavior after restoring a PostgreSQL database: the
schema of all serialfields default values are trimmed out.

For example:

CREATE TABLE testschema.testtable
(
id serial,
name character varying(255),
CONSTRAINT pk_testtable PRIMARY KEY (id)
)
WITH (
OIDS = FALSE
)
;

SELECT a.attnum, n.nspname, c.relname, d.adsrc AS default_value
FROM pg_attribute AS a
JOIN pg_class AS c ON a.attrelid = c.oid
JOIN pg_namespace AS n ON c.relnamespace = n.oid
LEFT OUTER JOIN pg_attrdef AS d ON d.adrelid = c.oid AND d.adnum = a.attnum
WHERE a.attnum > 0
AND n.nspname = 'testschema'
AND c.relname = 'testtable'

The id's default_value is nextval('testschema.testtable_id_seq'::regclass).

After restore, default_value changes to
nextval('testtable_id_seq'::regclass) and INSERT's start to fail as the
sequence can´t be found on it's schema.

*Backup*
$ pg_dump -F c -Z 9 -b -h localhost -U postgres -f backup dbname

*Restore*
$ pg_restore -U postgres -h localhost -l backup > backup.list
$ pg_restore -U postgres -h localhost --disable-triggers -O -d dbname -S
postgres -Fc -L backup.list backup

Is this some backup/restore problem? What am I doing wrong?

BTW, PostgreSQL version is 9.1.3 x64 running on Windows 7 (dev machine),
but can be reproduced on Linux x64 too.