diff --git a/packages/backend/src/core/RemoteUserResolveService.ts b/packages/backend/src/core/RemoteUserResolveService.ts
index 678da0cfa62d073c9769dc0f11415c2e5023587b..098b5e1706188dc5240195081c5f24e38795969a 100644
--- a/packages/backend/src/core/RemoteUserResolveService.ts
+++ b/packages/backend/src/core/RemoteUserResolveService.ts
@@ -54,7 +54,7 @@ export class RemoteUserResolveService {
 			}) as MiLocalUser;
 		}
 
-		host = this.utilityService.punyHost(host);
+		host = this.utilityService.toPuny(host);
 
 		if (host === this.utilityService.toPuny(this.config.host)) {
 			this.logger.info(`return local user: ${usernameLower}`);