diff --git a/pytec/tec_qt.py b/pytec/tec_qt.py
index 4dd8dca..6a0aaec 100755
--- a/pytec/tec_qt.py
+++ b/pytec/tec_qt.py
@@ -292,6 +292,7 @@ class MainWindow(QtWidgets.QMainWindow):
             self.loading_spinner.start()
             self.loading_spinner.show()
 
+    @asyncSlot(int)
     async def save_cfg_request(self, ch):
         assert self.thermostat.connected()