diff --git a/plugins/webstats/index.py b/plugins/webstats/index.py
index 7cfd5a3e3..1487ba900 100755
--- a/plugins/webstats/index.py
+++ b/plugins/webstats/index.py
@@ -254,21 +254,23 @@ def initDreplace():
     file_list = [
         'webstats_common.lua',
         'webstats_log.lua',
-        'webstats_worker.lua',
     ]
 
     for fl in file_list:
         loadLuaFile(fl)
 
     root_worker_dir = mw.getServerDir() + '/web_conf/nginx/lua/init_worker_by_lua_file'
-    webstats_worker_src_file = lua_dir = getServerDir() + "/lua/webstats_worker.lua"
     webstats_worker_dst_file = root_worker_dir + '/webstats_worker.lua'
 
-    content = mw.readFile(webstats_worker_src_file)
-    content = content.replace('{$SERVER_APP}', getServerDir())
-    content = content.replace('{$ROOT_PATH}', mw.getServerDir())
-    mw.writeFile(webstats_worker_dst_file, content)
-    mw.opLuaInitWorkerFile()
+    if not os.path.exists(webstats_worker_src_file):
+        loadLuaFile('webstats_worker.lua')
+        webstats_worker_src_file = lua_dir = getServerDir() + "/lua/webstats_worker.lua"
+        content = mw.readFile(webstats_worker_src_file)
+        content = content.replace('{$SERVER_APP}', getServerDir())
+        content = content.replace('{$ROOT_PATH}', mw.getServerDir())
+        mw.writeFile(webstats_worker_dst_file, content)
+        mw.opLuaInitWorkerFile()
+        os.remove(webstats_worker_src_file)
 
     loadConfigFile()
     loadLuaSiteFile()