diff --git a/libraries/AP_Compass/AP_Compass_AK8963.h b/libraries/AP_Compass/AP_Compass_AK8963.h
index 743189e2da..377e906a95 100644
--- a/libraries/AP_Compass/AP_Compass_AK8963.h
+++ b/libraries/AP_Compass/AP_Compass_AK8963.h
@@ -122,8 +122,8 @@ public:
     
     AP_HAL::Semaphore  *get_semaphore() override;
 
-    bool configure();
-    bool start_measurements();
+    bool configure() override;
+    bool start_measurements() override;
 
     // set device type within a device class
     void set_device_type(uint8_t devtype) override;
diff --git a/libraries/AP_Compass/AP_Compass_HIL.h b/libraries/AP_Compass/AP_Compass_HIL.h
index 61981fed06..3fb57be0ac 100644
--- a/libraries/AP_Compass/AP_Compass_HIL.h
+++ b/libraries/AP_Compass/AP_Compass_HIL.h
@@ -8,7 +8,7 @@ class AP_Compass_HIL : public AP_Compass_Backend
 {
 public:
     AP_Compass_HIL();
-    void read(void);
+    void read(void) override;
     bool init(void);
 
     // detect the sensor