diff --git a/packages/backend/src/server/api/endpoints/notes/local-timeline.ts b/packages/backend/src/server/api/endpoints/notes/local-timeline.ts
index bb7f830ced..2c873aecc3 100644
--- a/packages/backend/src/server/api/endpoints/notes/local-timeline.ts
+++ b/packages/backend/src/server/api/endpoints/notes/local-timeline.ts
@@ -74,9 +74,6 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		private redisTimelineService: RedisTimelineService,
 	) {
 		super(meta, paramDef, async (ps, me) => {
-			const untilId = ps.untilId ?? (ps.untilDate ? this.idService.genId(new Date(ps.untilDate!)) : null);
-			const sinceId = ps.sinceId ?? (ps.sinceDate ? this.idService.genId(new Date(ps.sinceDate!)) : null);
-
 			const policies = await this.roleService.getUserPolicies(me ? me.id : null);
 			if (!policies.ltlAvailable) {
 				throw new ApiError(meta.errors.ltlDisabled);
diff --git a/packages/backend/src/server/api/endpoints/notes/timeline.ts b/packages/backend/src/server/api/endpoints/notes/timeline.ts
index e9ee045e47..beebf26d02 100644
--- a/packages/backend/src/server/api/endpoints/notes/timeline.ts
+++ b/packages/backend/src/server/api/endpoints/notes/timeline.ts
@@ -67,8 +67,8 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		private redisTimelineService: RedisTimelineService,
 	) {
 		super(meta, paramDef, async (ps, me) => {
-			const untilId = ps.untilId ?? (ps.untilDate ? this.idService.genId(new Date(ps.untilDate!)) : null);
-			const sinceId = ps.sinceId ?? (ps.sinceDate ? this.idService.genId(new Date(ps.sinceDate!)) : null);
+			const untilId = ps.untilId ?? ps.untilDate ? this.idService.genId(new Date(ps.untilDate!)) : null;
+			const sinceId = ps.sinceId ?? ps.sinceDate ? this.idService.genId(new Date(ps.sinceDate!)) : null;
 
 			const [
 				followings,