diff --git a/pytec/tec_qt.py b/pytec/tec_qt.py
index 4fd3ff5..8a9f884 100644
--- a/pytec/tec_qt.py
+++ b/pytec/tec_qt.py
@@ -36,14 +36,13 @@ class ClientWatcher(QObject):
 
     def __init__(self, parent, client, update_s):
         self.update_s = update_s
-        self.running = False
         self.client = client
         self.watch_task = None
         super().__init__(parent)
 
     async def run(self):
         loop = asyncio.get_running_loop()
-        while self.running:
+        while True:
             time = loop.time()
             await self.update_params()
             await asyncio.sleep(self.update_s - (loop.time() - time))
@@ -52,12 +51,10 @@ class ClientWatcher(QObject):
         self.fan_update.emit(await self.client.fan())
 
     def start_watching(self):
-        self.running = True
         self.watch_task = asyncio.create_task(self.run())
 
     @pyqtSlot()
     def stop_watching(self):
-        self.running = False
         self.watch_task.cancel()
 
     @pyqtSlot(float)