diff --git a/weed/command/filer_remote_sync_dir.go b/weed/command/filer_remote_sync_dir.go
index 00f6d7493..dd3e94be6 100644
--- a/weed/command/filer_remote_sync_dir.go
+++ b/weed/command/filer_remote_sync_dir.go
@@ -278,7 +278,10 @@ func updateLocalEntry(filerClient filer_pb.FilerClient, dir string, entry *filer
 }
 
 func isMultipartUploadFile(dir string, name string) bool {
+	return isMultipartUploadDir(dir) &&	strings.HasSuffix(name, ".part")
+}
+
+func isMultipartUploadDir(dir string) bool {
 	return strings.HasPrefix(dir, "/buckets/") &&
-		strings.Contains(dir, "/"+s3_constants.MultipartUploadsFolder+"/") &&
-		strings.HasSuffix(name, ".part")
+		strings.Contains(dir, "/"+s3_constants.MultipartUploadsFolder+"/")
 }
diff --git a/weed/command/filer_sync.go b/weed/command/filer_sync.go
index d84c6325c..dc954e805 100644
--- a/weed/command/filer_sync.go
+++ b/weed/command/filer_sync.go
@@ -394,9 +394,11 @@ func genProcessFunction(sourcePath string, targetPath string, excludePaths []str
 		if debug {
 			glog.V(0).Infof("received %v", resp)
 		}
-		if strings.Contains(resp.Directory, "/"+s3_constants.MultipartUploadsFolder+"/") {
+
+		if isMultipartUploadDir(resp.Directory) {
 			return nil
 		}
+
 		if !strings.HasPrefix(resp.Directory, sourcePath) {
 			return nil
 		}