diff --git a/google-cloud-storage/src/main/java/com/google/cloud/storage/AsyncAppendingQueue.java b/google-cloud-storage/src/main/java/com/google/cloud/storage/AsyncAppendingQueue.java
index 3a9e01c882..a00c8d0359 100644
--- a/google-cloud-storage/src/main/java/com/google/cloud/storage/AsyncAppendingQueue.java
+++ b/google-cloud-storage/src/main/java/com/google/cloud/storage/AsyncAppendingQueue.java
@@ -90,7 +90,7 @@ private AsyncAppendingQueue(
     lock = new ReentrantLock();
   }
 
-  synchronized AsyncAppendingQueue<T> append(ApiFuture<T> value) throws ShortCircuitException {
+  AsyncAppendingQueue<T> append(ApiFuture<T> value) throws ShortCircuitException {
     lock.lock();
     try {
       checkState(state.isOpen(), "already closed");
@@ -124,7 +124,7 @@ T await() {
   }
 
   @Override
-  public synchronized void close() {
+  public void close() {
     lock.lock();
     try {
       if (!state.isOpen()) {