diff --git a/src/FirmwarePlugin/APM/APMFirmwarePlugin.h b/src/FirmwarePlugin/APM/APMFirmwarePlugin.h
index 56f935aa8ea089264a6cb1e39d2b5689d4109a2f..80a20945ca672d566e4f619087070f0cc7a1084d 100644
--- a/src/FirmwarePlugin/APM/APMFirmwarePlugin.h
+++ b/src/FirmwarePlugin/APM/APMFirmwarePlugin.h
@@ -79,7 +79,7 @@ public:
     bool        setFlightMode(const QString& flightMode, uint8_t* base_mode, uint32_t* custom_mode) final;
     bool        isGuidedMode(const Vehicle* vehicle) const final;
     void        pauseVehicle(Vehicle* vehicle);
-    int         manualControlReservedButtonCount(void) final;
+    int         manualControlReservedButtonCount(void);
     bool        adjustIncomingMavlinkMessage(Vehicle* vehicle, mavlink_message_t* message) final;
     void        adjustOutgoingMavlinkMessage(Vehicle* vehicle, mavlink_message_t* message) final;
     void        initializeVehicle(Vehicle* vehicle) final;
diff --git a/src/FirmwarePlugin/APM/ArduSubFirmwarePlugin.cc b/src/FirmwarePlugin/APM/ArduSubFirmwarePlugin.cc
index e6fad43ea24d8abd36b2a6f1cb382fc2d6c25d81..ea1538a9e473525da69ae6ff0e82c4c9e750bcc9 100644
--- a/src/FirmwarePlugin/APM/ArduSubFirmwarePlugin.cc
+++ b/src/FirmwarePlugin/APM/ArduSubFirmwarePlugin.cc
@@ -47,3 +47,8 @@ ArduSubFirmwarePlugin::ArduSubFirmwarePlugin(void)
     supportedFlightModes << APMSubMode(APMSubMode::ALT_HOLD  ,true);
     setSupportedModes(supportedFlightModes);
 }
+
+int ArduSubFirmwarePlugin::manualControlReservedButtonCount(void)
+{
+    return 0;
+}
diff --git a/src/FirmwarePlugin/APM/ArduSubFirmwarePlugin.h b/src/FirmwarePlugin/APM/ArduSubFirmwarePlugin.h
index 1030a459dc7ad9227f8aacd9370014a3c37591b2..a927a44d9edd004754206324bb5544fa334d2a6d 100644
--- a/src/FirmwarePlugin/APM/ArduSubFirmwarePlugin.h
+++ b/src/FirmwarePlugin/APM/ArduSubFirmwarePlugin.h
@@ -67,6 +67,7 @@ public:
     ArduSubFirmwarePlugin(void);
 
     // Overrides from FirmwarePlugin
+    int manualControlReservedButtonCount(void);
 
 };