diff --git a/driver-core/src/main/com/mongodb/internal/connection/DefaultServerMonitor.java b/driver-core/src/main/com/mongodb/internal/connection/DefaultServerMonitor.java
index bb97517d31..109df9cc78 100644
--- a/driver-core/src/main/com/mongodb/internal/connection/DefaultServerMonitor.java
+++ b/driver-core/src/main/com/mongodb/internal/connection/DefaultServerMonitor.java
@@ -181,7 +181,7 @@ class ServerMonitor extends Thread implements AutoCloseable {
         private volatile long lookupStartTimeNanos;
 
         ServerMonitor() {
-            super("cluster-" + serverId.getClusterId() + "-" + serverId.getAddress());
+            super("cluster-" + serverId.getClusterId().getValue() + "-" + serverId.getAddress());
             setDaemon(true);
         }