diff --git a/sql/db_update_1.1-alpha4_1.1-alpha5_postgres.sql b/sql/db_update_1.1-alpha4_1.1-alpha5_postgres.sql
index cdcd31a7..38b5b49a 100644
--- a/sql/db_update_1.1-alpha4_1.1-alpha5_postgres.sql
+++ b/sql/db_update_1.1-alpha4_1.1-alpha5_postgres.sql
@@ -1,4 +1,4 @@
-ALTER TABLE {PREFIX}images ADD COLUMN realname varchar(255) not null default '';
-ALTER TABLE {PREFIX}references ADD COLUMN type varchar(128) not null default '';
+ALTER TABLE {PREFIX}images ADD COLUMN realname varchar(255);
+ALTER TABLE {PREFIX}references ADD COLUMN type varchar(128);
 CREATE INDEX reftype_idx ON {PREFIX}references (type);