diff --git a/proxy/src/main/java/org/apache/rocketmq/proxy/grpc/v2/consumer/AckMessageActivity.java b/proxy/src/main/java/org/apache/rocketmq/proxy/grpc/v2/consumer/AckMessageActivity.java
index 65c4f4fb3d..42cc3a8645 100644
--- a/proxy/src/main/java/org/apache/rocketmq/proxy/grpc/v2/consumer/AckMessageActivity.java
+++ b/proxy/src/main/java/org/apache/rocketmq/proxy/grpc/v2/consumer/AckMessageActivity.java
@@ -36,7 +36,6 @@ import org.apache.rocketmq.proxy.grpc.v2.common.GrpcClientSettingsManager;
 import org.apache.rocketmq.proxy.grpc.v2.common.GrpcConverter;
 import org.apache.rocketmq.proxy.grpc.v2.common.ResponseBuilder;
 import org.apache.rocketmq.proxy.processor.MessagingProcessor;
-import org.checkerframework.checker.units.qual.C;
 
 public class AckMessageActivity extends AbstractMessingActivity {