diff --git a/src/message-like.ts b/src/message-like.ts
index 6b2947c..b1d68bc 100644
--- a/src/message-like.ts
+++ b/src/message-like.ts
@@ -9,6 +9,10 @@ export default class MessageLike {
 		return this.messageOrNote.id;
 	}
 
+	public get user() {
+		return this.messageOrNote.user;
+	}
+
 	public get userId() {
 		return this.messageOrNote.userId;
 	}
diff --git a/src/modules/emoji/index.ts b/src/modules/emoji/index.ts
index 74a1209..7ea2fa9 100644
--- a/src/modules/emoji/index.ts
+++ b/src/modules/emoji/index.ts
@@ -122,7 +122,7 @@ export default class EmojiModule implements IModule {
 	public install = (ai: 藍) => { }
 
 	public onMention = (msg: MessageLike) => {
-		if (msg.text && msg.text.indexOf('絵文字') > -1) {
+		if (msg.text && msg.text.includes('絵文字')) {
 			const hand = hands[Math.floor(Math.random() * hands.length)];
 			const face = faces[Math.floor(Math.random() * faces.length)];
 			const emoji = Array.isArray(hand) ? hand[0] + face + hand[1] : hand + face + hand;
diff --git a/src/modules/fortune/index.ts b/src/modules/fortune/index.ts
index cf1e705..e72b77d 100644
--- a/src/modules/fortune/index.ts
+++ b/src/modules/fortune/index.ts
@@ -28,7 +28,7 @@ export default class EmojiModule implements IModule {
 	public install = (ai: 藍) => { }
 
 	public onMention = (msg: MessageLike) => {
-		if (msg.text && msg.text.indexOf('占') > -1) {
+		if (msg.text && msg.text.includes('占')) {
 			const date = new Date();
 			const seed = `${date.getFullYear()}/${date.getMonth()}/${date.getDay()}@${msg.userId}`;
 			const rng = seedrandom(seed);
diff --git a/src/modules/ping/index.ts b/src/modules/ping/index.ts
index 0dee2c4..3fac725 100644
--- a/src/modules/ping/index.ts
+++ b/src/modules/ping/index.ts
@@ -6,7 +6,7 @@ export default class PingModule implements IModule {
 	public install = (ai: 藍) => { }
 
 	public onMention = (msg: MessageLike) => {
-		if (msg.text && msg.text.indexOf('ping') > -1) {
+		if (msg.text && msg.text.includes('ping')) {
 			msg.reply('PONG!');
 			return true;
 		} else {
diff --git a/src/modules/reversi/index.ts b/src/modules/reversi/index.ts
index ae8c00b..882b84b 100644
--- a/src/modules/reversi/index.ts
+++ b/src/modules/reversi/index.ts
@@ -38,7 +38,7 @@ export default class ReversiModule implements IModule {
 	}
 
 	public onMention = (msg: MessageLike) => {
-		if (msg.text && msg.text.indexOf('リバーシ') > -1) {
+		if (msg.text && msg.text.includes('リバーシ')) {
 			if (config.reversiEnabled) {
 				msg.reply(serifs.REVERSI_OK);
 
diff --git a/src/modules/server/index.ts b/src/modules/server/index.ts
index 8a67fc5..d52d627 100644
--- a/src/modules/server/index.ts
+++ b/src/modules/server/index.ts
@@ -4,14 +4,15 @@ import 藍 from '../../ai';
 import IModule from '../../module';
 import serifs from '../../serifs';
 import config from '../../config';
+import MessageLike from '../../message-like';
 const ReconnectingWebSocket = require('../../../node_modules/reconnecting-websocket/dist/reconnecting-websocket-cjs.js');
 
 export default class ServerModule implements IModule {
 	private ai: 藍;
 	private connection?: any;
-	private rebootScheduled = false;
-	private rebootTimer: any;
-	private rebootTimerSub: any;
+	private preventScheduleReboot = false;
+	private rebootTimer: NodeJS.Timer;
+	private rebootTimerSub: NodeJS.Timer;
 
 	public install = (ai: 藍) => {
 		this.ai = ai;
@@ -59,9 +60,9 @@ export default class ServerModule implements IModule {
 	}
 
 	private scheduleReboot = () => {
-		if (this.rebootScheduled) return;
+		if (this.preventScheduleReboot) return;
 
-		this.rebootScheduled = true;
+		this.preventScheduleReboot = true;
 
 		this.ai.post({
 			text: serifs.REBOOT_SCHEDULED
@@ -78,4 +79,28 @@ export default class ServerModule implements IModule {
 			});
 		}, 1000 * 50);
 	}
+
+	public onMention = (msg: MessageLike) => {
+		if (msg.text && msg.text.includes('再起動しないで')) {
+			if (msg.user.isAdmin) {
+				msg.reply(serifs.REBOOT_CANCEL_REQUESTED_ACCEPT);
+
+				this.ai.post({
+					text: serifs.REBOOT_CANCELED
+				});
+
+				clearTimeout(this.rebootTimer);
+				clearTimeout(this.rebootTimerSub);
+
+				setTimeout(() => {
+					this.preventScheduleReboot = false;
+				}, 1000 * 60 * 3);
+			} else {
+				msg.reply(serifs.REBOOT_CANCEL_REQUESTED_REJECT);
+			}
+			return true;
+		} else {
+			return false;
+		}
+	}
 }
diff --git a/src/serifs.ts b/src/serifs.ts
index ae23a2b..dc3b7bc 100644
--- a/src/serifs.ts
+++ b/src/serifs.ts
@@ -20,6 +20,11 @@ export default {
 	REBOOT: 'では、まもなくサーバーを再起動します！',
 	REBOOT_DETAIL: '(私も再起動に巻き込まれちゃうので、サーバーの再起動が完了したことのお知らせはできません...)',
 
+	REBOOT_CANCEL_REQUESTED_ACCEPT: 'わかりました。再起動の予定を取り消しました！',
+	REBOOT_CANCEL_REQUESTED_REJECT: 'ごめんなさい、再起動の取り消しは管理者のみが行えます...',
+
+	REBOOT_CANCELED: '再起動が取り消されました。お騒がせしました',
+
 	/**
 	 * 絵文字生成
 	 */