diff --git a/packages/backend/src/core/QueryService.ts b/packages/backend/src/core/QueryService.ts
index 65b6bc2ef4..8cdfb20bb9 100644
--- a/packages/backend/src/core/QueryService.ts
+++ b/packages/backend/src/core/QueryService.ts
@@ -11,6 +11,7 @@ import type { UserProfilesRepository, FollowingsRepository, ChannelFollowingsRep
 import { bindThis } from '@/decorators.js';
 import { IdService } from '@/core/IdService.js';
 import type { SelectQueryBuilder } from 'typeorm';
+import {MiBlockingType} from "@/models/_.js";
 
 @Injectable()
 export class QueryService {
@@ -73,7 +74,7 @@ export class QueryService {
 		const blockingQuery = this.blockingsRepository.createQueryBuilder('blocking')
 			.select('blocking.blockerId')
 			.where('blocking.blockeeId = :blockeeId', { blockeeId: me.id })
-			.andWhere('blocking.blockType = "user"');
+			.andWhere('blocking.blockType = :blockType', { blockType: MiBlockingType.User });
 
 		// 投稿の作者にブロックされていない かつ
 		// 投稿の返信先の作者にブロックされていない かつ
@@ -99,7 +100,7 @@ export class QueryService {
 		const blockingQuery = this.blockingsRepository.createQueryBuilder('blocking')
 			.select('blocking.blockeeId')
 			.where('blocking.blockerId = :blockerId', { blockerId: me.id })
-			.andWhere('blocking.blockType = "user"');
+			.andWhere('blocking.blockType = :blockType', { blockType: MiBlockingType.User });
 
 		const blockedQuery = this.blockingsRepository.createQueryBuilder('blocking')
 			.select('blocking.blockerId')
diff --git a/packages/backend/src/core/entities/UserEntityService.ts b/packages/backend/src/core/entities/UserEntityService.ts
index c61587c595..df2c803691 100644
--- a/packages/backend/src/core/entities/UserEntityService.ts
+++ b/packages/backend/src/core/entities/UserEntityService.ts
@@ -291,25 +291,25 @@ export class UserEntityService implements OnModuleInit {
 			this.blockingsRepository.createQueryBuilder('b')
 				.select('b.blockeeId')
 				.where('b.blockerId = :me', { me })
-				.andWhere('b.blockType = "user"')
+				.andWhere('b.blockType = :type', { type: MiBlockingType.User })
 				.getRawMany<{ b_blockeeId: string }>()
 				.then(it => it.map(it => it.b_blockeeId)),
 			this.blockingsRepository.createQueryBuilder('b')
 				.select('b.blockerId')
 				.where('b.blockeeId = :me', { me })
-				.andWhere('b.blockType = "user"')
+				.andWhere('b.blockType = :type', { type: MiBlockingType.User })
 				.getRawMany<{ b_blockerId: string }>()
 				.then(it => it.map(it => it.b_blockerId)),
 			this.blockingsRepository.createQueryBuilder('b')
 				.select('b.blockeeId')
 				.where('b.blockerId = :me', { me })
-				.andWhere('b.blockType = "reaction"')
+				.andWhere('b.blockType = :type', { type: MiBlockingType.Reaction })
 				.getRawMany<{ b_blockeeId: string }>()
 				.then(it => it.map(it => it.b_blockeeId)),
 			this.blockingsRepository.createQueryBuilder('b')
 				.select('b.blockerId')
 				.where('b.blockeeId = :me', { me })
-				.andWhere('b.blockType = "reaction"')
+				.andWhere('b.blockType = :type', { type: MiBlockingType.Reaction })
 				.getRawMany<{ b_blockerId: string }>()
 				.then(it => it.map(it => it.b_blockerId)),
 			this.mutingsRepository.createQueryBuilder('m')
diff --git a/packages/backend/src/server/api/endpoints/blocking-reaction-user/list.ts b/packages/backend/src/server/api/endpoints/blocking-reaction-user/list.ts
index 5055bd596b..f4cb38ec1e 100644
--- a/packages/backend/src/server/api/endpoints/blocking-reaction-user/list.ts
+++ b/packages/backend/src/server/api/endpoints/blocking-reaction-user/list.ts
@@ -9,6 +9,7 @@ import type { BlockingsRepository } from '@/models/_.js';
 import { QueryService } from '@/core/QueryService.js';
 import { BlockingEntityService } from '@/core/entities/BlockingEntityService.js';
 import { DI } from '@/di-symbols.js';
+import { MiBlockingType } from '@/models/Blocking.js';
 
 export const meta = {
 	tags: ['account'],
@@ -50,7 +51,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		super(meta, paramDef, async (ps, me) => {
 			const query = this.queryService.makePaginationQuery(this.blockingsRepository.createQueryBuilder('blocking'), ps.sinceId, ps.untilId)
 				.andWhere('blocking.blockerId = :meId', { meId: me.id })
-				.andWhere('blocking.blockType = "reaction"');
+				.andWhere('blocking.blockType = :blockType', { blockType: MiBlockingType.Reaction });
 
 			const blockings = await query
 				.limit(ps.limit)
diff --git a/packages/backend/src/server/api/endpoints/blocking/list.ts b/packages/backend/src/server/api/endpoints/blocking/list.ts
index f7a5fa1412..292bc0417e 100644
--- a/packages/backend/src/server/api/endpoints/blocking/list.ts
+++ b/packages/backend/src/server/api/endpoints/blocking/list.ts
@@ -9,6 +9,7 @@ import type { BlockingsRepository } from '@/models/_.js';
 import { QueryService } from '@/core/QueryService.js';
 import { BlockingEntityService } from '@/core/entities/BlockingEntityService.js';
 import { DI } from '@/di-symbols.js';
+import { MiBlockingType } from '@/models/Blocking.js';
 
 export const meta = {
 	tags: ['account'],
@@ -50,7 +51,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		super(meta, paramDef, async (ps, me) => {
 			const query = this.queryService.makePaginationQuery(this.blockingsRepository.createQueryBuilder('blocking'), ps.sinceId, ps.untilId)
 				.andWhere('blocking.blockerId = :meId', { meId: me.id })
-				.andWhere('blocking.blockType = "user"');
+				.andWhere('blocking.blockType = :blockType', { blockType: MiBlockingType.User });
 
 			const blockings = await query
 				.limit(ps.limit)
diff --git a/packages/backend/test/unit/entities/UserEntityService.ts b/packages/backend/test/unit/entities/UserEntityService.ts
index b28d386b43..c5c69cdb74 100644
--- a/packages/backend/test/unit/entities/UserEntityService.ts
+++ b/packages/backend/test/unit/entities/UserEntityService.ts
@@ -12,7 +12,7 @@ import { secureRndstr } from '@/misc/secure-rndstr.js';
 import { genAidx } from '@/misc/id/aidx.js';
 import {
 	BlockingsRepository,
-	FollowingsRepository, FollowRequestsRepository,
+	FollowingsRepository, FollowRequestsRepository, MiBlockingType,
 	MiUserProfile, MutingsRepository, RenoteMutingsRepository,
 	UserMemoRepository,
 	UserProfilesRepository,
@@ -115,7 +115,7 @@ describe('UserEntityService', () => {
 				id: genAidx(Date.now()),
 				blockerId: blocker.id,
 				blockeeId: blockee.id,
-				isReactionBlock: false,
+				blockType: MiBlockingType.User,
 			});
 		}
 
@@ -124,7 +124,7 @@ describe('UserEntityService', () => {
 				id: genAidx(Date.now()),
 				blockerId: blocker.id,
 				blockeeId: blockee.id,
-				isReactionBlock: true,
+				blockType: MiBlockingType.Reaction,
 			});
 		}