diff --git a/pytec/pytec/gui/model/thermostat.py b/pytec/pytec/gui/model/thermostat.py
index e370ba1..96abbeb 100644
--- a/pytec/pytec/gui/model/thermostat.py
+++ b/pytec/pytec/gui/model/thermostat.py
@@ -34,6 +34,7 @@ class Thermostat(QObject, metaclass=PropertyMeta):
         self._watch_task = None
         self._report_mode_task = None
         self._poll_for_report = True
+        self.task = None
         super().__init__(parent)
 
     async def run(self):