diff --git a/src/main/java/org/apache/hadoop/fs/CosNativeFileSystemStore.java b/src/main/java/org/apache/hadoop/fs/CosNativeFileSystemStore.java
index 690f4aea..d923c807 100644
--- a/src/main/java/org/apache/hadoop/fs/CosNativeFileSystemStore.java
+++ b/src/main/java/org/apache/hadoop/fs/CosNativeFileSystemStore.java
@@ -1271,6 +1271,7 @@ private <X> Object callCOSClientWithRetry(X request) throws CosServiceException,
                     }
                     LOG.warn("Complete mpu resp not complete key [{}]", key);
                     // todo: some other double check after cgi unified the ctime of mpu.
+                    return new CompleteMultipartUploadResult();
                 } else {
                     throw new IOException(nce);
                 }