diff --git a/packages/backend/src/server/api/endpoints/i/update.ts b/packages/backend/src/server/api/endpoints/i/update.ts
index 6919e601cd..2d32420843 100644
--- a/packages/backend/src/server/api/endpoints/i/update.ts
+++ b/packages/backend/src/server/api/endpoints/i/update.ts
@@ -236,8 +236,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 			if (ps.birthday !== undefined) profileUpdates.birthday = ps.birthday;
 			if (ps.ffVisibility !== undefined) profileUpdates.ffVisibility = ps.ffVisibility;
 			if (ps.mutedWords !== undefined) {
-				// TODO: ちゃんと数える
-				const length = JSON.stringify(ps.mutedWords).length;
+				const length = ps.mutedWords.length;
 				if (length > (await this.roleService.getUserPolicies(user.id)).wordMuteLimit) {
 					throw new ApiError(meta.errors.tooManyMutedWords);
 				}
diff --git a/packages/frontend/src/pages/admin/roles.editor.vue b/packages/frontend/src/pages/admin/roles.editor.vue
index 55203e159a..68d911e17d 100644
--- a/packages/frontend/src/pages/admin/roles.editor.vue
+++ b/packages/frontend/src/pages/admin/roles.editor.vue
@@ -338,7 +338,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 					</MkRange>
 				</div>
 			</MkFolder>
-			
+
 			<MkFolder v-if="matchQuery([i18n.ts._role._options.canSearchNotes, 'canSearchNotes'])">
 				<template #label>{{ i18n.ts._role._options.canSearchNotes }}</template>
 				<template #suffix>
@@ -469,7 +469,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 						<template #label>{{ i18n.ts._role.useBaseValue }}</template>
 					</MkSwitch>
 					<MkInput v-model="role.policies.wordMuteLimit.value" :disabled="role.policies.wordMuteLimit.useDefault" type="number" :readonly="readonly">
-						<template #suffix>chars</template>
+						<template #suffix>items</template>
 					</MkInput>
 					<MkRange v-model="role.policies.wordMuteLimit.priority" :min="0" :max="2" :step="1" easing :textConverter="(v) => v === 0 ? i18n.ts._role._priority.low : v === 1 ? i18n.ts._role._priority.middle : v === 2 ? i18n.ts._role._priority.high : ''">
 						<template #label>{{ i18n.ts._role.priority }}</template>
diff --git a/packages/frontend/src/pages/admin/roles.vue b/packages/frontend/src/pages/admin/roles.vue
index 6c4f156217..d87d584daa 100644
--- a/packages/frontend/src/pages/admin/roles.vue
+++ b/packages/frontend/src/pages/admin/roles.vue
@@ -169,7 +169,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 							<template #label>{{ i18n.ts._role._options.wordMuteMax }}</template>
 							<template #suffix>{{ policies.wordMuteLimit }}</template>
 							<MkInput v-model="policies.wordMuteLimit" type="number">
-								<template #suffix>chars</template>
+								<template #suffix>items</template>
 							</MkInput>
 						</MkFolder>