diff --git a/pulsar-broker/src/main/java/org/apache/pulsar/broker/admin/impl/NamespacesBase.java b/pulsar-broker/src/main/java/org/apache/pulsar/broker/admin/impl/NamespacesBase.java
index 8eef9259de79f..1a08e6ced9ca8 100644
--- a/pulsar-broker/src/main/java/org/apache/pulsar/broker/admin/impl/NamespacesBase.java
+++ b/pulsar-broker/src/main/java/org/apache/pulsar/broker/admin/impl/NamespacesBase.java
@@ -227,7 +227,8 @@ protected void internalDeleteNamespace(AsyncResponse asyncResponse, boolean auth
         boolean isEmpty;
         List<String> topics;
         try {
-            topics = pulsar().getNamespaceService().getListOfPersistentTopics(namespaceName).join();
+            topics = pulsar().getNamespaceService().getListOfPersistentTopics(namespaceName)
+                    .get(config().getZooKeeperOperationTimeoutSeconds(), TimeUnit.SECONDS);
             topics.addAll(getPartitionedTopicList(TopicDomain.persistent));
             topics.addAll(getPartitionedTopicList(TopicDomain.non_persistent));
             isEmpty = topics.isEmpty();