diff --git a/schema/01_initial.sql b/schema/01_initial.sql
index b305827..587bab5 100644
--- a/schema/01_initial.sql
+++ b/schema/01_initial.sql
@@ -19,7 +19,7 @@ create table if not exists pools(
 create table if not exists containers(
   layer3domain_id integer not null references layer3domains(id),
   network cidr not null,
-  pool_id integer not null,
+  pool_id integer,
   created_at timestamptz not null default now(),
   created_by varchar(128) not null,
   modified_at timestamptz not null default now(),