diff --git a/google-cloud-clients/google-cloud-pubsub/src/main/java/com/google/cloud/pubsub/v1/AckReplyConsumer.java b/google-cloud-clients/google-cloud-pubsub/src/main/java/com/google/cloud/pubsub/v1/AckReplyConsumer.java
index b3989fc974cb..9fd9bc837c5c 100644
--- a/google-cloud-clients/google-cloud-pubsub/src/main/java/com/google/cloud/pubsub/v1/AckReplyConsumer.java
+++ b/google-cloud-clients/google-cloud-pubsub/src/main/java/com/google/cloud/pubsub/v1/AckReplyConsumer.java
@@ -29,6 +29,4 @@ public interface AckReplyConsumer {
    * message.
    */
   void nack();
-
-  void abandon();
 }
diff --git a/google-cloud-clients/google-cloud-pubsub/src/main/java/com/google/cloud/pubsub/v1/MessageDispatcher.java b/google-cloud-clients/google-cloud-pubsub/src/main/java/com/google/cloud/pubsub/v1/MessageDispatcher.java
index 6586dc68e535..5f5ebbaee204 100644
--- a/google-cloud-clients/google-cloud-pubsub/src/main/java/com/google/cloud/pubsub/v1/MessageDispatcher.java
+++ b/google-cloud-clients/google-cloud-pubsub/src/main/java/com/google/cloud/pubsub/v1/MessageDispatcher.java
@@ -133,7 +133,6 @@ private class AckHandler implements ApiFutureCallback<AckReply> {
     private final int outstandingBytes;
     private final long receivedTimeMillis;
     private final Instant totalExpiration;
-    private boolean extending = true;
 
     AckHandler(String ackId, int outstandingBytes, Instant totalExpiration) {
       this.ackId = ackId;
@@ -152,7 +151,6 @@ private void forget() {
          */
         return;
       }
-      extending = false;
       flowController.release(1, outstandingBytes);
       messagesWaiter.incrementPendingMessages(-1);
       processOutstandingBatches();
@@ -419,11 +417,6 @@ public void ack() {
             public void nack() {
               response.set(AckReply.NACK);
             }
-
-            @Override
-            public void abandon() {
-              ackHandler.forget();
-            }
           };
       ApiFutures.addCallback(response, ackHandler, MoreExecutors.directExecutor());
       executor.execute(
@@ -478,9 +471,6 @@ void extendDeadlines() {
     Instant extendTo = now.plusSeconds(extendSeconds);
 
     for (Map.Entry<String, AckHandler> entry : pendingMessages.entrySet()) {
-      if (!entry.getValue().extending) {
-        continue;
-      }
       String ackId = entry.getKey();
       Instant totalExpiration = entry.getValue().totalExpiration;
       if (totalExpiration.isAfter(extendTo)) {
diff --git a/google-cloud-clients/google-cloud-pubsub/src/test/java/com/google/cloud/pubsub/v1/MessageDispatcherTest.java b/google-cloud-clients/google-cloud-pubsub/src/test/java/com/google/cloud/pubsub/v1/MessageDispatcherTest.java
index 2bd2a518bfef..785368bb13cb 100644
--- a/google-cloud-clients/google-cloud-pubsub/src/test/java/com/google/cloud/pubsub/v1/MessageDispatcherTest.java
+++ b/google-cloud-clients/google-cloud-pubsub/src/test/java/com/google/cloud/pubsub/v1/MessageDispatcherTest.java
@@ -148,14 +148,6 @@ public void testNack() throws Exception {
     assertThat(sentModAcks).contains(ModAckItem.of(TEST_MESSAGE.getAckId(), 0));
   }
 
-  @Test
-  public void testAbandon() throws Exception {
-    dispatcher.processReceivedMessages(Collections.singletonList(TEST_MESSAGE), NOOP_RUNNABLE);
-    consumers.take().abandon();
-    dispatcher.extendDeadlines();
-    assertThat(sentModAcks).doesNotContain(TEST_MESSAGE.getAckId());
-  }
-
   @Test
   public void testExtension() throws Exception {
     dispatcher.processReceivedMessages(Collections.singletonList(TEST_MESSAGE), NOOP_RUNNABLE);