diff --git a/pulsar-broker-common/src/main/java/org/apache/pulsar/bookie/rackawareness/IsolatedBookieEnsemblePlacementPolicy.java b/pulsar-broker-common/src/main/java/org/apache/pulsar/bookie/rackawareness/IsolatedBookieEnsemblePlacementPolicy.java
index 67fc9d24164a16..02b39a0950beda 100644
--- a/pulsar-broker-common/src/main/java/org/apache/pulsar/bookie/rackawareness/IsolatedBookieEnsemblePlacementPolicy.java
+++ b/pulsar-broker-common/src/main/java/org/apache/pulsar/bookie/rackawareness/IsolatedBookieEnsemblePlacementPolicy.java
@@ -63,7 +63,7 @@ public class IsolatedBookieEnsemblePlacementPolicy extends RackawareEnsemblePlac
     private ImmutablePair<Set<String>, Set<String>> defaultIsolationGroups;
 
     private MetadataCache<BookiesRackConfiguration> bookieMappingCache;
-    //For test.
+    @VisibleForTesting
     long metaOpTimeout = TimeUnit.SECONDS.toMillis(30);
 
     public IsolatedBookieEnsemblePlacementPolicy() {