diff --git a/code/stuff/topic_sensor3.py b/code/stuff/topic_sensor3.py
index fd2fc02..aef4076 100644
--- a/code/stuff/topic_sensor3.py
+++ b/code/stuff/topic_sensor3.py
@@ -16,6 +16,7 @@ def make_quaternion(angle):
     return Quaternion(*q)
 
 def save_value(value):
+    global angle
     with lock: # <1>
         angle = value * 2 * pi / 100.0 # <2>
     
@@ -30,6 +31,7 @@ def save_value(value):
 
     pub = rospy.Publisher('angle', Quaternion, queue_size=10) 
 
+    global angle
     angle = None # <4>
     rate = rospy.Rate(10.0)
     while not rospy.is_shutdown():