diff --git a/pytec/tec_qt.py b/pytec/tec_qt.py
index fe89724..2069c37 100644
--- a/pytec/tec_qt.py
+++ b/pytec/tec_qt.py
@@ -120,11 +120,11 @@ class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
         with QSignalBlocker(self.fan_auto_box):
             self.fan_auto_box.setChecked(fan_settings["auto_mode"])
 
-    @asyncSlot()
-    async def fan_set(self):
+    @asyncSlot(int)
+    async def fan_set(self, value):
         if self.tec_client is None or self.fan_auto_box.isChecked():
             return
-        await self.tec_client.set_param("fan", self.fan_power_slider.value())
+        await self.tec_client.set_param("fan", value)
 
     @asyncSlot(int)
     async def fan_auto_set(self, enabled):