diff --git a/opcua_connector.py b/opcua_connector.py
index 88b311a..347a486 100644
--- a/opcua_connector.py
+++ b/opcua_connector.py
@@ -6,6 +6,7 @@ import datetime
 import pandas as pd
 from influxdb_client import InfluxDBClient, Point, WritePrecision
 from influxdb_client.client.write_api import SYNCHRONOUS
+from tool_gencert import make_cert