diff --git a/packages/backend/migration/1665091090561-add-renote-muting.js b/packages/backend/migration/1665091090561-add-renote-muting.js
index d2ed2bd2e..f87114851 100644
--- a/packages/backend/migration/1665091090561-add-renote-muting.js
+++ b/packages/backend/migration/1665091090561-add-renote-muting.js
@@ -12,5 +12,9 @@ export class addRenoteMuting1665091090561 {
 	}
 
 	async down(queryRunner) {
+		await queryRunner.query(`DROP INDEX "IDX_renote_muting_createdAt"`);
+		await queryRunner.query(`DROP INDEX "IDX_renote_muting_muteeId"`);
+		await queryRunner.query(`DROP INDEX "IDX_renote_muting_muterId"`);
+		await queryRunner.query(`DROP TABLE "renote_muting"`);
 	}
 }