diff --git a/pytec/tec_qt.py b/pytec/tec_qt.py
index e582053..26279fc 100644
--- a/pytec/tec_qt.py
+++ b/pytec/tec_qt.py
@@ -109,10 +109,10 @@ class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
         logging.debug(fan_settings)
         if fan_settings is None:
             return
-        with QSignalBlocker(self.fan_power_slider) as _:
+        with QSignalBlocker(self.fan_power_slider):
             self.fan_power_slider.setValue(fan_settings["fan_pwm"])
             self.fan_power_slider.setEnabled(not fan_settings["auto_mode"])
-        with QSignalBlocker(self.fan_auto_box) as _:
+        with QSignalBlocker(self.fan_auto_box):
             self.fan_auto_box.setChecked(fan_settings["auto_mode"])
 
     @asyncSlot()