diff --git a/source/common/src/cos.c b/source/common/src/cos.c
index ea41afd8fb..6643cc3925 100644
--- a/source/common/src/cos.c
+++ b/source/common/src/cos.c
@@ -520,7 +520,7 @@ int32_t s3PutObjectFromFile2(const char *file, const char *object) {
 
     // div round up
     int      seq;
-    uint64_t chunk_size = MULTIPART_CHUNK_SIZE >> 8;
+    uint64_t chunk_size = MULTIPART_CHUNK_SIZE >> 7;
     int      totalSeq = ((contentLength + chunk_size - 1) / chunk_size);
 
     MultipartPartData partData;