diff --git a/service/callback/upload.go b/service/callback/upload.go
index fcb3f49..698d50c 100644
--- a/service/callback/upload.go
+++ b/service/callback/upload.go
@@ -173,9 +173,9 @@ func (service *OneDriveCallback) PreProcess(c *gin.Context) serializer.Response
 	actualPath := strings.TrimPrefix(uploadSession.SavePath, "/")
 	isSizeCheckFailed := uploadSession.Size != info.Size
 
-	// SharePoint 会对 Office 文档增加 meta data 导致文件大小不一致，这里增加 100 KB 宽容
+	// SharePoint 会对 Office 文档增加 meta data 导致文件大小不一致，这里增加 1 MB 宽容
 	// See: https://github.com/OneDrive/onedrive-api-docs/issues/935
-	if strings.Contains(fs.Policy.OptionsSerialized.OdDriver, "sharepoint.com") && isSizeCheckFailed && (info.Size > uploadSession.Size) && (info.Size-uploadSession.Size <= 102400) {
+	if strings.Contains(fs.Policy.OptionsSerialized.OdDriver, "sharepoint.com") && isSizeCheckFailed && (info.Size > uploadSession.Size) && (info.Size-uploadSession.Size <= 1048576) {
 		isSizeCheckFailed = false
 	}