diff --git a/packages/backend/src/remote/activitypub/models/person.ts b/packages/backend/src/remote/activitypub/models/person.ts
index c02905fab..12efe7a78 100644
--- a/packages/backend/src/remote/activitypub/models/person.ts
+++ b/packages/backend/src/remote/activitypub/models/person.ts
@@ -302,7 +302,7 @@ export async function createPerson(
 					tags,
 					isBot,
 					isCat: (person as any).isCat === true,
-					speakAsCat: person.speakAsCat,
+					speakAsCat: (person as any).speakAsCat === true,
 					isIndexable: person.indexable,
 				}),
 			)) as IRemoteUser;
@@ -549,6 +549,7 @@ export async function updatePerson(
 		tags,
 		isBot: getApType(object) !== "Person",
 		isCat: (person as any).isCat === true,
+		speakAsCat: (person as any).speakAsCat === true,
 		isIndexable: person.indexable,
 		isLocked: !!person.manuallyApprovesFollowers,
 		movedToUri: person.movedTo || null,
diff --git a/packages/backend/test/e2e/users.ts b/packages/backend/test/e2e/users.ts
index 1090dc1cb..86e254aeb 100644
--- a/packages/backend/test/e2e/users.ts
+++ b/packages/backend/test/e2e/users.ts
@@ -69,6 +69,7 @@ describe("ユーザー", () => {
 			avatarBlurhash: user.avatarBlurhash,
 			isBot: user.isBot,
 			isCat: user.isCat,
+			speakAsCat: user.speakAsCat,
 			instance: user.instance,
 			emojis: user.emojis,
 			onlineStatus: user.onlineStatus,
@@ -401,6 +402,7 @@ describe("ユーザー", () => {
 		assert.strictEqual(response.avatarBlurhash, null);
 		assert.strictEqual(response.isBot, false);
 		assert.strictEqual(response.isCat, false);
+		assert.strictEqual(response.speakAsCat, false);
 		assert.strictEqual(response.instance, undefined);
 		assert.deepStrictEqual(response.emojis, {});
 		assert.strictEqual(response.onlineStatus, "unknown");
@@ -538,6 +540,8 @@ describe("ユーザー", () => {
 		{ parameters: (): object => ({ isBot: false }) },
 		{ parameters: (): object => ({ isCat: true }) },
 		{ parameters: (): object => ({ isCat: false }) },
+		{ parameters: (): object => ({ speakAsCat: true }) },
+		{ parameters: (): object => ({ speakAsCat: false }) },
 		{ parameters: (): object => ({ injectFeaturedNote: true }) },
 		{ parameters: (): object => ({ injectFeaturedNote: false }) },
 		{ parameters: (): object => ({ receiveAnnouncementEmail: true }) },
diff --git a/packages/client/src/pages/settings/profile.vue b/packages/client/src/pages/settings/profile.vue
index 7362d86f5..2e43b1b18 100644
--- a/packages/client/src/pages/settings/profile.vue
+++ b/packages/client/src/pages/settings/profile.vue
@@ -141,7 +141,7 @@
 			}}</template></FormSwitch
 		>
 		<FormSwitch
-			v-if="profile.isCat"
+			v-if="profile.speakAsCat"
 			v-model="profile.speakAsCat"
 			class="_formBlock"
 			>{{ i18n.ts.flagSpeakAsCat