diff --git a/ArduPlane/afs_plane.h b/ArduPlane/afs_plane.h
index 6920ddd5fa..98053aff3b 100644
--- a/ArduPlane/afs_plane.h
+++ b/ArduPlane/afs_plane.h
@@ -30,14 +30,14 @@ public:
     AP_AdvancedFailsafe_Plane(AP_Mission &_mission, const AP_GPS &_gps);
 
     // called to set all outputs to termination state
-    void terminate_vehicle(void);
+    void terminate_vehicle(void) override;
     
 protected:
     // setup failsafe values for if FMU firmware stops running
-    void setup_IO_failsafe(void);
+    void setup_IO_failsafe(void) override;
 
     // return the AFS mapped control mode
-    enum control_mode afs_mode(void);
+    enum control_mode afs_mode(void) override;
 };
 
 #endif // ADVANCED_FAILSAFE