diff --git a/packages/backend/src/core/SearchService.ts b/packages/backend/src/core/SearchService.ts
index 5794d27d4a..d16f9eb6bd 100644
--- a/packages/backend/src/core/SearchService.ts
+++ b/packages/backend/src/core/SearchService.ts
@@ -281,7 +281,7 @@ export class SearchService {
 		if (this.config.fulltextSearch?.provider === 'sqlPgroonga') {
 			query.andWhere('note.text &@~ :q', { q });
 		} else {
-			query.andWhere('LOWER(note.text) LIKE :q', { q: `%${ sqlLikeEscape(q.toLowerCase()) }%` });
+			query.andWhere('note.text ILIKE :q', { q: `%${ sqlLikeEscape(q) }%` });
 		}
 
 		if (opts.host) {