diff --git a/thermostat.py b/thermostat.py
index 17fc8d2..e0a6491 100644
--- a/thermostat.py
+++ b/thermostat.py
@@ -213,6 +213,7 @@ migrate = Migrate(app, db, compare_type=True)
 #sys.stdout.flush() 
 
 target_name = default_target
+forced_mode = None
 
 def thermostat_loop():
   start_time = time.time()
@@ -220,6 +221,7 @@ def thermostat_loop():
   new_forced_mode = None
   first_loop = True
   global target_name
+  global forced_mode
 
   while True:
   #  if stop.is_set():