diff --git a/system/hardware/tici/power_monitor.py b/system/hardware/tici/power_monitor.py
index 3e00376b23..f9d1e3cc41 100755
--- a/system/hardware/tici/power_monitor.py
+++ b/system/hardware/tici/power_monitor.py
@@ -2,6 +2,7 @@
 import sys
 import time
 import datetime
+import numpy as np
 from typing import List
 
 from common.realtime import Ratekeeper