diff --git a/server/migration/postgres/1772000000000-FixBlocklistIdDefault.ts b/server/migration/postgres/1772000000000-FixBlocklistIdDefault.ts
new file mode 100644
index 00000000..fbf07048
--- /dev/null
+++ b/server/migration/postgres/1772000000000-FixBlocklistIdDefault.ts
@@ -0,0 +1,20 @@
+import type { MigrationInterface, QueryRunner } from 'typeorm';
+
+export class FixBlocklistIdDefault1772000000000 implements MigrationInterface {
+  name = 'FixBlocklistIdDefault1772000000000';
+
+  public async up(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(
+      `ALTER TABLE "blocklist" ALTER COLUMN "id" SET DEFAULT nextval('public."blocklist_id_seq"'::regclass)`
+    );
+
+    await queryRunner.query(
+      `SELECT setval('public."blocklist_id_seq"', COALESCE((SELECT MAX("id") FROM "blocklist"), 0) + 1, false)`
+    );
+  }
+
+  public async down(): Promise<void> {
+    // Intentionally left empty: dropping the DEFAULT on blocklist.id would
+    // reintroduce the original bug and break blocklist inserts.
+  }
+}