diff --git a/pulsar-broker/src/test/java/org/apache/pulsar/broker/stats/prometheus/NamespaceStatsAggregatorTest.java b/pulsar-broker/src/test/java/org/apache/pulsar/broker/stats/prometheus/NamespaceStatsAggregatorTest.java
index e091eee178d8c..e51d6a886e010 100644
--- a/pulsar-broker/src/test/java/org/apache/pulsar/broker/stats/prometheus/NamespaceStatsAggregatorTest.java
+++ b/pulsar-broker/src/test/java/org/apache/pulsar/broker/stats/prometheus/NamespaceStatsAggregatorTest.java
@@ -23,6 +23,7 @@
 import java.util.List;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
+import lombok.Cleanup;
 import org.apache.bookkeeper.mledger.ManagedLedger;
 import org.apache.bookkeeper.mledger.impl.ManagedLedgerMBeanImpl;
 import org.apache.bookkeeper.mledger.util.StatsBuckets;
@@ -103,6 +104,7 @@ public void testGenerateSubscriptionsStats() {
         PersistentTopicMetrics persistentTopicMetrics = new PersistentTopicMetrics();
         when(topic.getPersistentTopicMetrics()).thenReturn(persistentTopicMetrics);
         topicsMap.put("my-topic", topic);
+        @Cleanup("releaseAll")
         PrometheusMetricStreams metricStreams = Mockito.spy(new PrometheusMetricStreams());
 
         // Populate subscriptions stats