diff --git a/packages/backend/migration/1703749589203-abuse-user-report-category-camel-case.js b/packages/backend/migration/1703749589203-abuse-user-report-category-camel-case.js
deleted file mode 100644
index 6d653c0027..0000000000
--- a/packages/backend/migration/1703749589203-abuse-user-report-category-camel-case.js
+++ /dev/null
@@ -1,28 +0,0 @@
-/*
- * SPDX-FileCopyrightText: syuilo and other misskey contributors
- * SPDX-License-Identifier: AGPL-3.0-only
- */
-
-export class AbuseUserReportCategoryCamelCase1703749589203 {
-    name = 'AbuseUserReportCategoryCamelCase1703749589203'
-
-    async up(queryRunner) {
-        await queryRunner.query(`UPDATE "abuse_user_report" SET "category" = 'personalInfoLeak' WHERE "category" = 'personalinfoleak'`);
-        await queryRunner.query(`UPDATE "abuse_user_report" SET "category" = 'selfHarm' WHERE "category" = 'selfharm'`);
-        await queryRunner.query(`UPDATE "abuse_user_report" SET "category" = 'criticalBreach' WHERE "category" = 'criticalbreach'`);
-        await queryRunner.query(`UPDATE "abuse_user_report" SET "category" = 'otherBreach' WHERE "category" = 'otherbreach'`);
-        await queryRunner.query(`UPDATE "abuse_user_report" SET "category" = 'violationRights' WHERE "category" = 'violationrights'`);
-        await queryRunner.query(`UPDATE "abuse_user_report" SET "category" = 'violationRightsOther' WHERE "category" = 'violationrightsother'`);
-        await queryRunner.query(`UPDATE "abuse_user_report" SET "category" = 'notLike' WHERE "category" = 'notlike'`);
-    }
-
-    async down(queryRunner) {
-        await queryRunner.query(`UPDATE "abuse_user_report" SET "category" = 'personalinfoleak' WHERE "category" = 'personalInfoLeak'`);
-        await queryRunner.query(`UPDATE "abuse_user_report" SET "category" = 'selfharm' WHERE "category" = 'selfHarm'`);
-        await queryRunner.query(`UPDATE "abuse_user_report" SET "category" = 'criticalbreach' WHERE "category" = 'criticalBreach'`);
-        await queryRunner.query(`UPDATE "abuse_user_report" SET "category" = 'otherbreach' WHERE "category" = 'otherBreach'`);
-        await queryRunner.query(`UPDATE "abuse_user_report" SET "category" = 'violationrights' WHERE "category" = 'violationRights'`);
-        await queryRunner.query(`UPDATE "abuse_user_report" SET "category" = 'violationrightsother' WHERE "category" = 'violationRightsOther'`);
-        await queryRunner.query(`UPDATE "abuse_user_report" SET "category" = 'notlike' WHERE "category" = 'notLike'`);
-    }
-}
diff --git a/packages/backend/src/server/api/endpoints/users/report-abuse.ts b/packages/backend/src/server/api/endpoints/users/report-abuse.ts
index 814a5fd623..5f966ff6a0 100644
--- a/packages/backend/src/server/api/endpoints/users/report-abuse.ts
+++ b/packages/backend/src/server/api/endpoints/users/report-abuse.ts
@@ -63,14 +63,6 @@ export const paramDef = {
 				'violationRights',
 				'violationRightsOther',
 				'other',
-				// for compatibility
-				'personalinfoleak',
-				'selfharm',
-				'criticalbreach',
-				'otherbreach',
-				'violationrights',
-				'violationrightsother',
-				'notlike',
 			],
 		},
 	},
@@ -103,20 +95,6 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				throw new ApiError(meta.errors.cannotReportAdmin);
 			}
 
-			// for compatibility
-			if (ps.category === 'notlike') {
-				return;
-			}
-
-			const categoriesMap: Record<string, typeof paramDef['properties']['category']['enum'][number]> = {
-				'personalinfoleak': 'personalInfoLeak',
-				'selfharm': 'selfHarm',
-				'criticalbreach': 'criticalBreach',
-				'otherbreach': 'otherBreach',
-				'violationrights': 'violationRights',
-				'violationrightsother': 'violationRightsOther',
-			};
-
 			const report = await this.abuseUserReportsRepository.insert({
 				id: this.idService.gen(),
 				targetUserId: user.id,
@@ -124,7 +102,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				reporterId: me.id,
 				reporterHost: null,
 				comment: ps.comment,
-				category: typeof categoriesMap[ps.category] === 'string' ? categoriesMap[ps.category] : ps.category,
+				category: ps.category,
 			}).then(x => this.abuseUserReportsRepository.findOneByOrFail(x.identifiers[0]));
 
 			this.queueService.createReportAbuseJob(report);