diff --git a/amazon-kinesis-client/src/main/java/software/amazon/kinesis/leases/HierarchicalShardSyncer.java b/amazon-kinesis-client/src/main/java/software/amazon/kinesis/leases/HierarchicalShardSyncer.java
index 4f677524..369bd347 100644
--- a/amazon-kinesis-client/src/main/java/software/amazon/kinesis/leases/HierarchicalShardSyncer.java
+++ b/amazon-kinesis-client/src/main/java/software/amazon/kinesis/leases/HierarchicalShardSyncer.java
@@ -110,7 +110,7 @@ public class HierarchicalShardSyncer {
      * @throws KinesisClientLibIOException
      */
     // CHECKSTYLE:OFF CyclomaticComplexity
-    public synchronized boolean checkAndCreateLeaseForNewShards(@NonNull final ShardDetector shardDetector,
+    public boolean checkAndCreateLeaseForNewShards(@NonNull final ShardDetector shardDetector,
             final LeaseRefresher leaseRefresher, final InitialPositionInStreamExtended initialPosition,
             final MetricsScope scope, final boolean ignoreUnexpectedChildShards, final boolean isLeaseTableEmpty)
             throws DependencyException, InvalidStateException, ProvisionedThroughputException, KinesisClientLibIOException, InterruptedException {