diff --git a/src/VehicleSetup/FirmwareUpgrade.qml b/src/VehicleSetup/FirmwareUpgrade.qml
index a34a0fc..5d4611d 100644
--- a/src/VehicleSetup/FirmwareUpgrade.qml
+++ b/src/VehicleSetup/FirmwareUpgrade.qml
@@ -208,7 +208,7 @@ SetupPage {
                                             firmwareSelectDialog.preventClose = true
                                             return
                                         }
-                                        if (ardupilotFirmwareSelectionCombo.currentIndex == 0) {
+                                        if (ardupilotFirmwareSelectionCombo.currentIndex == -1) {
                                             mainWindow.showMessageDialog(firmwareSelectDialog.title, qsTr("You must choose a board type."))
                                             firmwareSelectDialog.preventClose = true
                                             return