diff --git a/src/maintain/scripts/test.py b/src/maintain/scripts/test.py
index cd856b5..214299a 100755
--- a/src/maintain/scripts/test.py
+++ b/src/maintain/scripts/test.py
@@ -5,6 +5,7 @@ import cv2 as cv
 from matplotlib import pyplot as plt
 import rospy
 import tf2_ros
+import tf
 from sensor_msgs.msg import Image , CameraInfo
 from geometry_msgs.msg import PoseStamped, TransformStamped, Quaternion
 import message_filters