diff --git a/src/models/note.ts b/src/models/note.ts
index 3c1c2e18e1..6d315db4cf 100644
--- a/src/models/note.ts
+++ b/src/models/note.ts
@@ -66,7 +66,6 @@ export type INote = {
 	};
 	_user: {
 		host: string;
-		hostLower: string;
 		account: {
 			inbox?: string;
 		};
diff --git a/src/models/user.ts b/src/models/user.ts
index 97b7a997e5..cf5a4a3616 100644
--- a/src/models/user.ts
+++ b/src/models/user.ts
@@ -49,7 +49,6 @@ type IUserBase = {
 	isSuspended: boolean;
 	keywords: string[];
 	host: string;
-	hostLower: string;
 };
 
 export interface ILocalUser extends IUserBase {
diff --git a/src/queue/processors/http/process-inbox.ts b/src/queue/processors/http/process-inbox.ts
index ce5b7d5a89..a2c6bf4f90 100644
--- a/src/queue/processors/http/process-inbox.ts
+++ b/src/queue/processors/http/process-inbox.ts
@@ -32,7 +32,7 @@ export default async (job: kue.Job, done): Promise<void> => {
 			return;
 		}
 
-		user = await User.findOne({ usernameLower: username, hostLower: host }) as IRemoteUser;
+		user = await User.findOne({ usernameLower: username, host: host.toLowerCase() }) as IRemoteUser;
 	} else {
 		user = await User.findOne({
 			host: { $ne: null },
diff --git a/src/remote/activitypub/objects/person.ts b/src/remote/activitypub/objects/person.ts
index f7ec064cdb..6c060f879c 100644
--- a/src/remote/activitypub/objects/person.ts
+++ b/src/remote/activitypub/objects/person.ts
@@ -74,8 +74,7 @@ export async function createPerson(value: any, resolver?: Resolver): Promise<IUs
 		webFinger(person.id)
 	]);
 
-	const host = toUnicode(finger.subject.replace(/^.*?@/, ''));
-	const hostLower = host.replace(/[A-Z]+/, matched => matched.toLowerCase());
+	const host = toUnicode(finger.subject.replace(/^.*?@/, '')).toLowerCase();
 	const summaryDOM = JSDOM.fragment(person.summary);
 
 	// Create user
@@ -92,7 +91,6 @@ export async function createPerson(value: any, resolver?: Resolver): Promise<IUs
 		username: person.preferredUsername,
 		usernameLower: person.preferredUsername.toLowerCase(),
 		host,
-		hostLower,
 		publicKey: {
 			id: person.publicKey.id,
 			publicKeyPem: person.publicKey.publicKeyPem
diff --git a/src/remote/resolve-user.ts b/src/remote/resolve-user.ts
index 346e134c9f..5cb35cadef 100644
--- a/src/remote/resolve-user.ts
+++ b/src/remote/resolve-user.ts
@@ -4,19 +4,19 @@ import webFinger from './webfinger';
 import config from '../config';
 import { createPerson } from './activitypub/objects/person';
 
-export default async (username, host, option) => {
+export default async (username, _host, option) => {
 	const usernameLower = username.toLowerCase();
-	const hostLowerAscii = toASCII(host).toLowerCase();
-	const hostLower = toUnicode(hostLowerAscii);
+	const hostAscii = toASCII(_host).toLowerCase();
+	const host = toUnicode(hostAscii);
 
-	if (config.host == hostLower) {
+	if (config.host == host) {
 		return await User.findOne({ usernameLower });
 	}
 
-	let user = await User.findOne({ usernameLower, hostLower }, option);
+	let user = await User.findOne({ usernameLower, host }, option);
 
 	if (user === null) {
-		const acctLower = `${usernameLower}@${hostLowerAscii}`;
+		const acctLower = `${usernameLower}@${hostAscii}`;
 
 		const finger = await webFinger(acctLower);
 		const self = finger.links.find(link => link.rel && link.rel.toLowerCase() === 'self');
diff --git a/src/server/api/common/get-host-lower.ts b/src/server/api/common/get-host-lower.ts
index fc4b30439e..550c233001 100644
--- a/src/server/api/common/get-host-lower.ts
+++ b/src/server/api/common/get-host-lower.ts
@@ -1,5 +1,5 @@
 import { toUnicode } from 'punycode';
 
 export default host => {
-	return toUnicode(host).replace(/[A-Z]+/, match => match.toLowerCase());
+	return toUnicode(host).toLowerCase();
 };
diff --git a/src/server/api/endpoints/users/notes.ts b/src/server/api/endpoints/users/notes.ts
index e91b75e1d3..bd4247c79c 100644
--- a/src/server/api/endpoints/users/notes.ts
+++ b/src/server/api/endpoints/users/notes.ts
@@ -65,7 +65,7 @@ module.exports = (params, me) => new Promise(async (res, rej) => {
 
 	const q = userId !== undefined
 		? { _id: userId }
-		: { usernameLower: username.toLowerCase(), hostLower: getHostLower(host) } ;
+		: { usernameLower: username.toLowerCase(), host: getHostLower(host) } ;
 
 	// Lookup user
 	const user = await User.findOne(q, {
diff --git a/src/server/api/private/signup.ts b/src/server/api/private/signup.ts
index 15257b869f..cf51dec4d2 100644
--- a/src/server/api/private/signup.ts
+++ b/src/server/api/private/signup.ts
@@ -118,7 +118,6 @@ export default async (ctx: Koa.Context) => {
 		username: username,
 		usernameLower: username.toLowerCase(),
 		host: null,
-		hostLower: null,
 		keypair: generateKeypair(),
 		token: secret,
 		email: null,
diff --git a/src/services/note/create.ts b/src/services/note/create.ts
index b238cd5607..603851adb5 100644
--- a/src/services/note/create.ts
+++ b/src/services/note/create.ts
@@ -78,7 +78,6 @@ export default async (user: IUser, data: {
 		_renote: data.renote ? { userId: data.renote.userId } : null,
 		_user: {
 			host: user.host,
-			hostLower: user.hostLower,
 			inbox: isRemoteUser(user) ? user.inbox : undefined
 		}
 	};