diff --git a/src/com/wentch/redkale/net/http/WebSocketRunner.java b/src/com/wentch/redkale/net/http/WebSocketRunner.java
index 69e7aed2f..7d30f4093 100644
--- a/src/com/wentch/redkale/net/http/WebSocketRunner.java
+++ b/src/com/wentch/redkale/net/http/WebSocketRunner.java
@@ -220,7 +220,7 @@ public class WebSocketRunner implements Runnable {
         }
     }
 
-    public void closeRunner() {
+    public synchronized void closeRunner() {
         if (closed) return;
         closed = true;
         try {