diff --git a/packages/backend/src/core/FanoutTimelineEndpointService.ts b/packages/backend/src/core/FanoutTimelineEndpointService.ts
index ff8b22bde9..55ef7abf3c 100644
--- a/packages/backend/src/core/FanoutTimelineEndpointService.ts
+++ b/packages/backend/src/core/FanoutTimelineEndpointService.ts
@@ -75,7 +75,7 @@ export class FanoutTimelineEndpointService {
 		let noteIds = redisResultIds.filter(id => id >= thresholdId).slice(0, ps.limit);
 
 		const oldestNoteId = ascending ? redisResultIds[0] : redisResultIds[redisResultIds.length - 1];
-		shouldFallbackToDb = noteIds.length === 0 || ps.sinceId != null && ps.sinceId < oldestNoteId;
+		shouldFallbackToDb ||= noteIds.length === 0 || ps.sinceId != null && ps.sinceId < oldestNoteId;
 
 		if (!shouldFallbackToDb) {
 			let filter = ps.noteFilter ?? (_note => true);