diff --git a/main.py b/main.py
index 8f06c61..8734a0d 100755
--- a/main.py
+++ b/main.py
@@ -20,6 +20,8 @@ from tf.transformations import quaternion_from_euler
 
 import threading
 
+import time
+
 table = {
     'id':'t1',
     'rframe':'world',