diff --git a/sentinel-core/src/main/java/com/alibaba/csp/sentinel/slots/clusterbuilder/ClusterBuilderSlot.java b/sentinel-core/src/main/java/com/alibaba/csp/sentinel/slots/clusterbuilder/ClusterBuilderSlot.java
index 31ef6b65..acbc3895 100755
--- a/sentinel-core/src/main/java/com/alibaba/csp/sentinel/slots/clusterbuilder/ClusterBuilderSlot.java
+++ b/sentinel-core/src/main/java/com/alibaba/csp/sentinel/slots/clusterbuilder/ClusterBuilderSlot.java
@@ -70,7 +70,7 @@ public class ClusterBuilderSlot extends AbstractLinkedProcessorSlot<DefaultNode>
 
     private static final Object lock = new Object();
 
-    private ClusterNode clusterNode = null;
+    private volatile ClusterNode clusterNode = null;
 
     @Override
     public void entry(Context context, ResourceWrapper resourceWrapper, DefaultNode node, int count,