diff --git a/packages/peer/package.json b/packages/peer/package.json
index f8967bf6..9f6ed3ff 100644
--- a/packages/peer/package.json
+++ b/packages/peer/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@ddn/peer",
-  "version": "2.4.5",
+  "version": "2.4.6",
   "description": "DDN Peer.",
   "repository": {
     "type": "git",
diff --git a/packages/peer/src/kernal/program.js b/packages/peer/src/kernal/program.js
index b89cb125..b88b706e 100644
--- a/packages/peer/src/kernal/program.js
+++ b/packages/peer/src/kernal/program.js
@@ -107,9 +107,7 @@ class Program {
   _checkProcessState () {
     if (this.ctx.isDaemonMode) {
       try {
-        var fd = fs.openSync(this._pid_file, 'wx')
-        fs.writeSync(fd, process.pid)
-        fs.closeSync(fd)
+        fs.writeFileSync(this._pid_file, process.pid.toString(), { flag: 'wx' })
       } catch (err) {
         console.log('Failed: DDN server already started')
         process.exit(1)