diff --git a/packages/backend/src/server/api/endpoints/i/update.ts b/packages/backend/src/server/api/endpoints/i/update.ts
index ef5ab16bc4..fe09eca674 100644
--- a/packages/backend/src/server/api/endpoints/i/update.ts
+++ b/packages/backend/src/server/api/endpoints/i/update.ts
@@ -173,7 +173,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> {
 			if (ps.mutedWords !== undefined) {
 				// TODO: ちゃんと数える
 				const length = JSON.stringify(ps.mutedWords).length;
-				if (length > (await this.roleService.getUserRoleOptions(user.id)).antennaLimit) {
+				if (length > (await this.roleService.getUserRoleOptions(user.id)).wordMuteLimit) {
 					throw new ApiError(meta.errors.tooManyMutedWords);
 				}