diff --git a/agent.js b/agent.js
index b2afcc6..e9a2035 100644
--- a/agent.js
+++ b/agent.js
@@ -4,7 +4,6 @@ const loadSchedule = require('./lib/load_schedule');
 const parser = require('cron-parser');
 const ms = require('humanize-ms');
 const safetimers = require('safe-timers');
-const MAX_SAFE_TIME = Math.pow(2, 31) - 1;
 const SCHEDULE_HANDLER = Symbol.for('egg#scheduleHandler');
 
 module.exports = agent => {
@@ -106,7 +105,7 @@ function startCron(interval, listener) {
 }
 
 function safeTimeout(fn, delay, ...args) {
-  if (delay >= MAX_SAFE_TIME) {
+  if (delay < safetimers.maxInterval) {
     setTimeout(fn, delay, ...args);
   } else {
     safetimers.setTimeout(fn, delay, ...args);
@@ -114,7 +113,7 @@ function safeTimeout(fn, delay, ...args) {
 }
 
 function safeInterval(fn, delay, ...args) {
-  if (delay >= MAX_SAFE_TIME) {
+  if (delay < safetimers.maxInterval) {
     setInterval(fn, delay, ...args);
   } else {
     safetimers.setInterval(fn, delay, ...args);
diff --git a/test/fixtures/safe-timers/agent.js b/test/fixtures/safe-timers/agent.js
new file mode 100644
index 0000000..032bcd8
--- /dev/null
+++ b/test/fixtures/safe-timers/agent.js
@@ -0,0 +1,15 @@
+'use strict';
+
+const safetimers = require('safe-timers');
+
+module.exports = agent => {
+  safetimers.maxInterval = 4000;
+
+  const proto = safetimers.Timeout.prototype;
+  const originFn = proto.reschedule;
+
+  proto.reschedule = function(...args) {
+    agent.logger.info('reschedule', ...args);
+    originFn.call(this, ...args);
+  };
+}
\ No newline at end of file
diff --git a/test/fixtures/safe-timers/app/schedule/interval.js b/test/fixtures/safe-timers/app/schedule/interval.js
new file mode 100644
index 0000000..aae8c22
--- /dev/null
+++ b/test/fixtures/safe-timers/app/schedule/interval.js
@@ -0,0 +1,10 @@
+'use strict';
+
+exports.schedule = {
+  type: 'worker',
+  interval: 4321,
+};
+
+exports.task = function* (ctx) {
+  ctx.logger.info('interval');
+};
diff --git a/test/fixtures/safe-timers/app/schedule/sub/cron.js b/test/fixtures/safe-timers/app/schedule/sub/cron.js
new file mode 100644
index 0000000..f427b45
--- /dev/null
+++ b/test/fixtures/safe-timers/app/schedule/sub/cron.js
@@ -0,0 +1,10 @@
+'use strict';
+
+exports.schedule = {
+  type: 'worker',
+  cron: '*/5 * * * * *',
+};
+
+exports.task = function* (ctx) {
+  ctx.logger.info('cron');
+};
diff --git a/test/fixtures/safe-timers/config/plugin.js b/test/fixtures/safe-timers/config/plugin.js
new file mode 100644
index 0000000..a682a4c
--- /dev/null
+++ b/test/fixtures/safe-timers/config/plugin.js
@@ -0,0 +1,3 @@
+'use strict';
+
+exports.logrotator = false;
diff --git a/test/fixtures/safe-timers/package.json b/test/fixtures/safe-timers/package.json
new file mode 100644
index 0000000..f08c74a
--- /dev/null
+++ b/test/fixtures/safe-timers/package.json
@@ -0,0 +1,3 @@
+{
+  "name": "safe-timers"
+}
diff --git a/test/schedule.test.js b/test/schedule.test.js
index b372274..966957d 100644
--- a/test/schedule.test.js
+++ b/test/schedule.test.js
@@ -11,7 +11,7 @@ describe('test/schedule.test.js', () => {
 
   describe('schedule type worker', () => {
     it('should support interval and cron', function* () {
-      app = mm.cluster({ baseDir: 'worker', workers: 2 });
+      app = mm.cluster({ baseDir: 'worker', workers: 2, cache: false });
       yield app.ready();
       yield sleep(5000);
       const log = getLogContent('worker');
@@ -54,8 +54,8 @@ describe('test/schedule.test.js', () => {
       yield sleep(5000);
       const log = getLogContent('immediate');
       console.log(log);
-      assert(contains(log, 'immediate-interval') === 2);
-      assert(contains(log, 'immediate-cron') === 2);
+      assert(contains(log, 'immediate-interval') >= 2);
+      assert(contains(log, 'immediate-cron') >= 2);
     });
   });
 
@@ -203,14 +203,31 @@ describe('test/schedule.test.js', () => {
     });
   });
 
-
   describe('export schedules', () => {
     it('should export app.schedules', function* () {
-      app = mm.app({ baseDir: 'worker' });
+      app = mm.app({ baseDir: 'worker', cache: false });
       yield app.ready();
       assert(app.schedules);
     });
   });
+
+  describe('safe-timers', () => {
+    it('should support interval and cron', function* () {
+      app = mm.cluster({ baseDir: 'safe-timers', workers: 2, cache: false });
+      yield app.ready();
+      yield sleep(5000);
+
+      const log = getLogContent('safe-timers');
+      console.log(log);
+      assert(contains(log, 'interval') === 1);
+      assert(contains(log, 'cron') === 1);
+
+      const agentLog = getAgentLogContent('safe-timers');
+      console.log(agentLog);
+      assert(contains(agentLog, 'reschedule 4321') === 2);
+      assert(contains(agentLog, 'reschedule') >= 4);
+    });
+  });
 });
 
 function sleep(time) {
@@ -229,6 +246,11 @@ function getErrorLogContent(name) {
   return fs.readFileSync(logPath, 'utf8');
 }
 
+function getAgentLogContent(name) {
+  const logPath = path.join(__dirname, 'fixtures', name, 'logs', name, 'egg-agent.log');
+  return fs.readFileSync(logPath, 'utf8');
+}
+
 function contains(content, match) {
   return content.split('\n').filter(line => line.indexOf(match) >= 0).length;
 }