diff --git a/api/src/database/migrations/20210903A-add-auth-provider.ts b/api/src/database/migrations/20210903A-add-auth-provider.ts
index 8b14c63fa1..fa7541badc 100644
--- a/api/src/database/migrations/20210903A-add-auth-provider.ts
+++ b/api/src/database/migrations/20210903A-add-auth-provider.ts
@@ -1,13 +1,20 @@
 import { Knex } from 'knex';
 
 export async function up(knex: Knex): Promise<void> {
+	await knex.schema.alterTable('directus_users', (table) => {
+		table.dropUnique(['email']);
+	});
+
 	await knex.schema.alterTable('directus_users', (table) => {
 		table.string('provider', 128).notNullable().defaultTo('default');
 		table.string('external_identifier').unique();
-
 		table.string('email', 128).nullable().alter();
 	});
 
+	await knex.schema.alterTable('directus_users', (table) => {
+		table.unique(['email']);
+	});
+
 	await knex.schema.alterTable('directus_sessions', (table) => {
 		table.json('data');
 	});