diff --git a/pulsar-broker/src/main/java/org/apache/pulsar/broker/service/PulsarStats.java b/pulsar-broker/src/main/java/org/apache/pulsar/broker/service/PulsarStats.java
index 9cdf9d1dfc68d..2059aa04350d4 100644
--- a/pulsar-broker/src/main/java/org/apache/pulsar/broker/service/PulsarStats.java
+++ b/pulsar-broker/src/main/java/org/apache/pulsar/broker/service/PulsarStats.java
@@ -233,7 +233,7 @@ public synchronized void updateStats(
         updatedAt = System.currentTimeMillis();
     }
 
-    public NamespaceBundleStats invalidBundleStats(String bundleName) {
+    public synchronized NamespaceBundleStats invalidBundleStats(String bundleName) {
         return bundleStats.remove(bundleName);
     }
 
@@ -254,7 +254,7 @@ public BrokerOperabilityMetrics getBrokerOperabilityMetrics() {
         return brokerOperabilityMetrics;
     }
 
-    public Map<String, NamespaceBundleStats> getBundleStats() {
+    public synchronized Map<String, NamespaceBundleStats> getBundleStats() {
         return bundleStats;
     }