diff --git a/pom.xml b/pom.xml
index 3527230..609e431 100644
--- a/pom.xml
+++ b/pom.xml
@@ -853,6 +853,7 @@
           --add-opens java.base/java.util=ALL-UNNAMED <!--System Lambda-->
           --add-opens java.base/java.util.concurrent=ALL-UNNAMED <!--PowerMock-->
           --add-opens java.base/sun.net=ALL-UNNAMED <!--netty.DnsResolverUtil-->
+          --add-opens java.base/java.time=ALL-UNNAMED <!-- java.time.Duration -->
           --add-opens java.management/sun.management=ALL-UNNAMED <!--JvmDefaultGCMetricsLogger & MBeanStatsGenerator-->
           --add-opens jdk.management/com.sun.management.internal=ALL-UNNAMED <!--MBeanStatsGenerator-->
         </test.additional.args>
diff --git a/pulsar-client-kafka-compat/pulsar-client-kafka/src/main/java/org/apache/kafka/clients/consumer/PulsarKafkaConsumer.java b/pulsar-client-kafka-compat/pulsar-client-kafka/src/main/java/org/apache/kafka/clients/consumer/PulsarKafkaConsumer.java
index 83fb86a..53b01fb 100644
--- a/pulsar-client-kafka-compat/pulsar-client-kafka/src/main/java/org/apache/kafka/clients/consumer/PulsarKafkaConsumer.java
+++ b/pulsar-client-kafka-compat/pulsar-client-kafka/src/main/java/org/apache/kafka/clients/consumer/PulsarKafkaConsumer.java
@@ -521,7 +521,8 @@ private CompletableFuture<Void> doCommitOffsets(Map<TopicPartition, OffsetAndMet
             lastCommittedOffset.put(tp, offsetAndMetadata);
             MessageId msgId = MessageIdUtils.getMessageId(offsetAndMetadata.offset());
             if (consumer instanceof MultiTopicsConsumerImpl) {
-                msgId = new TopicMessageIdImpl(topicPartition.topic(), tp.topic(), msgId);
+                String partitionName = TopicName.get(topicPartition.topic()).getPartition(topicPartition.partition()).toString();
+                msgId = new TopicMessageIdImpl(partitionName, tp.topic(), msgId);
             }
             futures.add(consumer.acknowledgeCumulativeAsync(msgId));
         });
diff --git a/pulsar-client-kafka-compat/pulsar-client-kafka/src/test/java/org/apache/kafka/clients/consumer/PulsarKafkaConsumerTest.java b/pulsar-client-kafka-compat/pulsar-client-kafka/src/test/java/org/apache/kafka/clients/consumer/PulsarKafkaConsumerTest.java
new file mode 100644
index 0000000..ff254d6
--- /dev/null
+++ b/pulsar-client-kafka-compat/pulsar-client-kafka/src/test/java/org/apache/kafka/clients/consumer/PulsarKafkaConsumerTest.java
@@ -0,0 +1,147 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.kafka.clients.consumer;
+
+import org.apache.kafka.common.TopicPartition;
+import org.apache.kafka.common.serialization.StringDeserializer;
+import org.apache.pulsar.client.api.ClientBuilder;
+import org.apache.pulsar.client.api.ConsumerBuilder;
+import org.apache.pulsar.client.api.MessageId;
+import org.apache.pulsar.client.api.PulsarClientException;
+import org.apache.pulsar.client.impl.ConsumerImpl;
+import org.apache.pulsar.client.impl.MultiTopicsConsumerImpl;
+import org.apache.pulsar.client.impl.PulsarClientImpl;
+import org.apache.pulsar.client.impl.TopicMessageIdImpl;
+import org.apache.pulsar.client.kafka.compat.PulsarClientKafkaConfig;
+import org.apache.pulsar.client.kafka.compat.PulsarConsumerKafkaConfig;
+import org.apache.pulsar.client.util.MessageIdUtils;
+import org.apache.pulsar.common.naming.TopicName;
+import org.powermock.api.mockito.PowerMockito;
+import org.powermock.core.classloader.annotations.PowerMockIgnore;
+import org.powermock.core.classloader.annotations.PrepareForTest;
+import org.testng.IObjectFactory;
+import org.testng.annotations.ObjectFactory;
+import org.testng.annotations.Test;
+
+import java.time.Duration;
+import java.util.*;
+import java.util.concurrent.CompletableFuture;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.Mockito.*;
+
+@PrepareForTest({PulsarClientKafkaConfig.class, PulsarConsumerKafkaConfig.class})
+@PowerMockIgnore({"org.apache.logging.log4j.*", "org.apache.kafka.clients.consumer.ConsumerInterceptor"})
+public class PulsarKafkaConsumerTest {
+
+    @ObjectFactory
+    // Necessary to make PowerMockito.mockStatic work with TestNG.
+    public IObjectFactory getObjectFactory() {
+        return new org.powermock.modules.testng.PowerMockObjectFactory();
+    }
+
+    @Test
+    public void testCommitSync() throws PulsarClientException {
+
+        String topic = "persistent://prop/ns/t1";
+
+        ClientBuilder mockClientBuilder = mock(ClientBuilder.class);
+        ConsumerBuilder mockConsumerBuilder = mock(ConsumerBuilder.class);
+        PulsarClientImpl mockPulsarClient = mock(PulsarClientImpl.class);
+        MultiTopicsConsumerImpl mockMultiTopicsConsumerImpl = mock(MultiTopicsConsumerImpl.class);
+        ConsumerImpl mockConsumerImpl = mock(ConsumerImpl.class);
+
+        doReturn(mockClientBuilder).when(mockClientBuilder).serviceUrl(anyString());
+
+        PowerMockito.mockStatic(PulsarClientKafkaConfig.class);
+        PowerMockito.mockStatic(PulsarConsumerKafkaConfig.class);
+
+        when(PulsarClientKafkaConfig.getClientBuilder(any(Properties.class))).thenReturn(mockClientBuilder);
+        when(PulsarConsumerKafkaConfig.getConsumerBuilder(any(), any())).thenReturn(mockConsumerBuilder);
+        doReturn(mockPulsarClient).when(mockClientBuilder).build();
+        doReturn(mockConsumerBuilder).when(mockConsumerBuilder).clone();
+        doReturn(mockConsumerBuilder).when(mockConsumerBuilder).topic(any());
+
+
+        CompletableFuture<Void> voidFuture = new CompletableFuture<>();
+        voidFuture.complete(null);
+        doReturn(voidFuture).when(mockMultiTopicsConsumerImpl).acknowledgeCumulativeAsync(any(MessageId.class));
+        doReturn(voidFuture).when(mockConsumerImpl).acknowledgeCumulativeAsync(any(MessageId.class));
+
+        Properties properties = new Properties();
+        properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
+        properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
+        properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, Collections.singletonList("pulsar://localhost:6650"));
+
+        List<Integer> partitionCounts = Arrays.asList(0, 2);
+
+        for (Integer count : partitionCounts) {
+
+            CompletableFuture mockConsumerFuture = new CompletableFuture();
+            mockConsumerFuture.complete(isTopicPartitioned(count) ? mockMultiTopicsConsumerImpl : mockConsumerImpl);
+            doReturn(mockConsumerFuture).when(mockConsumerBuilder).subscribeAsync();
+
+            CompletableFuture mockPartitionFuture = new CompletableFuture();
+            mockPartitionFuture.complete(count);
+            doReturn(mockPartitionFuture).when(mockPulsarClient).getNumberOfPartitions(anyString());
+
+            Consumer<String, String> consumer = spy(new PulsarKafkaConsumer<>(properties));
+
+            Map<TopicPartition, List<ConsumerRecord<String, String>>> recordMap = getRecords(count, topic);
+            ConsumerRecords<String, String> mockRecords = new ConsumerRecords<>(recordMap);
+            doReturn(mockRecords).when(consumer).poll(any());
+
+            consumer.subscribe(Collections.singletonList(topic));
+
+            ConsumerRecords<String, String> records = consumer.poll(Duration.ofMillis(1000));
+            Map<TopicPartition, OffsetAndMetadata> offsets = new HashMap<>();
+            records.partitions().forEach(partition -> {
+                List<ConsumerRecord<String, String>> partitionRecords = records.records(partition);
+                long lastOffset = partitionRecords.get(partitionRecords.size() - 1).offset();
+                offsets.put(partition, new OffsetAndMetadata(lastOffset + 1));
+            });
+            consumer.commitSync(offsets);
+
+            if (isTopicPartitioned(count)) {
+                for (Map.Entry<TopicPartition, List<ConsumerRecord<String, String>>> record : recordMap.entrySet()) {
+                    MessageId msgId = MessageIdUtils.getMessageId(record.getValue().get(0).offset() + 1);
+                    String partitionName = TopicName.get(record.getKey().topic()).getPartition(record.getKey().partition()).toString();
+                    TopicMessageIdImpl topicMessageId = new TopicMessageIdImpl(partitionName, record.getKey().topic(), msgId);
+                    verify(mockMultiTopicsConsumerImpl, times(1)).acknowledgeCumulativeAsync(topicMessageId);
+                }
+            } else {
+                verify(mockConsumerImpl, times(records.partitions().size())).acknowledgeCumulativeAsync(any(MessageId.class));
+            }
+        }
+    }
+
+    private boolean isTopicPartitioned(int partitionsCount) {
+        return partitionsCount > 0;
+    }
+
+    private Map<TopicPartition, List<ConsumerRecord<String, String>>> getRecords(int partitionsCount, String topic) {
+        Map<TopicPartition, List<ConsumerRecord<String, String>>> recordMap = new HashMap<>();
+        recordMap.put(new TopicPartition(topic, 0), Collections.singletonList(new ConsumerRecord<>(topic, 0, 10L, "1", "1")));
+        for (int i = 1; i < partitionsCount; i++) {
+            recordMap.put(new TopicPartition(topic, 1), Collections.singletonList(new ConsumerRecord<>(topic, 1, 20L, "2", "1")));
+        }
+        return recordMap;
+    }
+}