diff --git a/lib/agent.js b/lib/agent.js
index f0228a690d..edae9a96df 100644
--- a/lib/agent.js
+++ b/lib/agent.js
@@ -26,10 +26,13 @@ class Agent extends EggApplication {
     // dump config after loaded, ensure all the dynamic modifications will be recorded
     const dumpStartTime = Date.now();
     this.dumpConfig();
-    this.coreLogger.info('[egg:core] dump config after load, %s', ms(Date.now() - dumpStartTime));
+    this.coreLogger.info(
+      '[egg:core] dump config after load, %s',
+      ms(Date.now() - dumpStartTime)
+    );
 
     // keep agent alive even it doesn't have any io tasks
-    setInterval(() => {}, 24 * 60 * 60 * 1000);
+    this.agentAliveHandler = setInterval(() => {}, 24 * 60 * 60 * 1000);
 
     this._uncaughtExceptionHandler = this._uncaughtExceptionHandler.bind(this);
     process.on('uncaughtException', this._uncaughtExceptionHandler);
@@ -55,7 +58,13 @@ class Agent extends EggApplication {
   }
 
   _wrapMessenger() {
-    for (const methodName of [ 'broadcast', 'sendTo', 'sendToApp', 'sendToAgent', 'sendRandom' ]) {
+    for (const methodName of [
+      'broadcast',
+      'sendTo',
+      'sendToApp',
+      'sendToAgent',
+      'sendRandom',
+    ]) {
       wrapMethod(methodName, this.messenger, this.coreLogger);
     }
 
@@ -63,8 +72,11 @@ class Agent extends EggApplication {
       const originMethod = messenger[methodName];
       messenger[methodName] = function() {
         const stack = new Error().stack.split('\n').slice(1).join('\n');
-        logger.warn('agent can\'t call %s before server started\n%s',
-          methodName, stack);
+        logger.warn(
+          "agent can't call %s before server started\n%s",
+          methodName,
+          stack
+        );
         originMethod.apply(this, arguments);
       };
       messenger.prependOnceListener('egg-ready', () => {
@@ -75,9 +87,9 @@ class Agent extends EggApplication {
 
   close() {
     process.removeListener('uncaughtException', this._uncaughtExceptionHandler);
+    clearInterval(this.agentAliveHandler);
     return super.close();
   }
-
 }
 
 module.exports = Agent;