diff --git a/dolphinscheduler-api/src/main/java/org/apache/dolphinscheduler/api/utils/ZooKeeperState.java b/dolphinscheduler-api/src/main/java/org/apache/dolphinscheduler/api/utils/ZooKeeperState.java
index 5aa6be858a..a33754397d 100644
--- a/dolphinscheduler-api/src/main/java/org/apache/dolphinscheduler/api/utils/ZooKeeperState.java
+++ b/dolphinscheduler-api/src/main/java/org/apache/dolphinscheduler/api/utils/ZooKeeperState.java
@@ -121,7 +121,7 @@ public class ZooKeeperState {
 	private class SendThread extends Thread {
 		private String cmd;
 
-		public String ret = "";
+		private String ret = "";
 
 		public SendThread(String cmd) {
 			this.cmd = cmd;