diff --git a/schema/init/idz.sql b/schema/init/idz.sql
index 3b25008..a593850 100644
--- a/schema/init/idz.sql
+++ b/schema/init/idz.sql
@@ -242,7 +242,6 @@ create table "idz_team_auto" (
             on delete cascade,
     "serial_no" integer not null,
     "name_idx" integer not null,
-    constraint "idz_team_auto_uq" unique ("serial_no", "name_idx")
 );
 
 create table "idz_team_member" (
diff --git a/schema/migrate/M0018-idz-auto-team-fix.sql b/schema/migrate/M0018-idz-auto-team-fix.sql
new file mode 100644
index 0000000..6be1a65
--- /dev/null
+++ b/schema/migrate/M0018-idz-auto-team-fix.sql
@@ -0,0 +1,13 @@
+create table "new_idz_team_auto" (
+    "id" integer primary key not null
+            references "idz_team"("id")
+            on delete cascade,
+    "serial_no" integer not null,
+    "name_idx" integer not null
+);
+
+insert into "new_idz_team_auto"
+select "id", "serial_no", "name_idx" from "idz_team_auto";
+
+drop table "idz_team_auto";
+alter table "new_idz_team_auto" rename to "idz_team_auto";