diff --git a/plugins/webstats/tool_migrate.py b/plugins/webstats/tool_migrate.py
index 103a35197..407088e64 100644
--- a/plugins/webstats/tool_migrate.py
+++ b/plugins/webstats/tool_migrate.py
@@ -85,6 +85,7 @@ def migrateSiteHotLogs(site_name, query_date):
         import shutil
         print("coping {} to {} ...".format(hot_db, hot_db_tmp))
         mw.writeFile(migrating_flag, "yes")
+        time.sleep(3)
         shutil.copy(hot_db, hot_db_tmp)
         if not os.path.exists(hot_db_tmp):
             return mw.returnMsg(False, "migrating fail, copy tmp file!")