diff --git a/pytec/tec_qt.py b/pytec/tec_qt.py
index a036aaf..7803a2f 100755
--- a/pytec/tec_qt.py
+++ b/pytec/tec_qt.py
@@ -139,10 +139,10 @@ class MainWindow(QtWidgets.QMainWindow):
             state == ThermostatConnectionState.CONNECTED
         )
         self.conn_menu.host_set_line.setEnabled(
-            state != ThermostatConnectionState.DISCONNECTED
+            state == ThermostatConnectionState.DISCONNECTED
         )
         self.conn_menu.port_set_spin.setEnabled(
-            state != ThermostatConnectionState.DISCONNECTED
+            state == ThermostatConnectionState.DISCONNECTED
         )
 
         match state: