diff --git a/api/src/database/migrations/20210626A-change-filesize-bigint.ts b/api/src/database/migrations/20210626A-change-filesize-bigint.ts
new file mode 100644
index 0000000000..53544c34c5
--- /dev/null
+++ b/api/src/database/migrations/20210626A-change-filesize-bigint.ts
@@ -0,0 +1,13 @@
+import { Knex } from 'knex';
+
+export async function up(knex: Knex): Promise<void> {
+	await knex.schema.alterTable('directus_files', (table) => {
+		table.bigInteger('filesize').nullable().defaultTo(null).alter();
+	});
+}
+
+export async function down(knex: Knex): Promise<void> {
+	await knex.schema.alterTable('directus_files', (table) => {
+		table.integer('filesize').nullable().defaultTo(null).alter();
+	});
+}