diff --git a/drivers/189pc/driver.go b/drivers/189pc/driver.go
index 29a1f5ab..5337f79d 100644
--- a/drivers/189pc/driver.go
+++ b/drivers/189pc/driver.go
@@ -607,7 +607,7 @@ func (driver Cloud189) CommonUpload(file *model.FileStream, parentFile *model.Fi
 
 		uploadData := uploadUrl.UploadUrls[fmt.Sprint("partNumber_", i)]
 		req, _ := http.NewRequest(http.MethodPut, uploadData.RequestURL, byteData)
-		req.Header.Del("User-Agent")
+		req.Header.Set("User-Agent", "")
 		for k, v := range ParseHttpHeader(uploadData.RequestHeader) {
 			req.Header.Set(k, v)
 		}
@@ -719,7 +719,7 @@ func (driver Cloud189) FastUpload(file *model.FileStream, parentFile *model.File
 		for i := 1; i <= count; i++ {
 			uploadData := uploadUrls.UploadUrls[fmt.Sprint("partNumber_", i)]
 			req, _ := http.NewRequest(http.MethodPut, uploadData.RequestURL, io.NewSectionReader(tempFile, int64(i-1)*DEFAULT, DEFAULT))
-			req.Header.Del("User-Agent")
+			req.Header.Set("User-Agent", "")
 			for k, v := range ParseHttpHeader(uploadData.RequestHeader) {
 				req.Header.Set(k, v)
 			}