diff --git a/plugins/openresty/index.py b/plugins/openresty/index.py
index 2efc7c70c..3f33225f8 100755
--- a/plugins/openresty/index.py
+++ b/plugins/openresty/index.py
@@ -4,6 +4,7 @@ import sys
 import io
 import os
 import time
+import threading
 import subprocess
 
 sys.path.append(os.getcwd() + "/class/core")