diff --git a/thermostat.py b/thermostat.py
index 61c0e66..17fc8d2 100644
--- a/thermostat.py
+++ b/thermostat.py
@@ -212,12 +212,14 @@ migrate = Migrate(app, db, compare_type=True)
 #    print(row)
 #sys.stdout.flush() 
 
+target_name = default_target
+
 def thermostat_loop():
   start_time = time.time()
   last_control_time = None
   new_forced_mode = None
-  target_name = default_target
   first_loop = True
+  global target_name
 
   while True:
   #  if stop.is_set():