diff --git a/package.json b/package.json
index 027aeab..4f89986 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "cos-nodejs-sdk-v5",
-  "version": "2.12.2",
+  "version": "2.12.3",
   "description": "cos nodejs sdk v5",
   "main": "index.js",
   "types": "index.d.ts",
diff --git a/sdk/advance.js b/sdk/advance.js
index 530c5fe..cf8ea44 100644
--- a/sdk/advance.js
+++ b/sdk/advance.js
@@ -1140,7 +1140,6 @@ function sliceCopyFile(params, callback) {
             params.PartList = list;
         })();
 
-        var TargetHeader;
         if (params.Headers['x-cos-metadata-directive'] === 'Replaced') {
             TargetHeader = params.Headers;
         } else {