diff --git a/libraries/AP_IRLock/AP_IRLock_I2C.h b/libraries/AP_IRLock/AP_IRLock_I2C.h
index 1262eaefc1..862274beb3 100644
--- a/libraries/AP_IRLock/AP_IRLock_I2C.h
+++ b/libraries/AP_IRLock/AP_IRLock_I2C.h
@@ -13,7 +13,7 @@ public:
     void init(int8_t bus) override;
 
     // retrieve latest sensor data - returns true if new data is available
-    bool update();
+    bool update() override;
 
 private:
     AP_HAL::OwnPtr<AP_HAL::Device> dev;
diff --git a/libraries/AP_IRLock/AP_IRLock_SITL.h b/libraries/AP_IRLock/AP_IRLock_SITL.h
index 9f59c99a79..caac3d64bd 100644
--- a/libraries/AP_IRLock/AP_IRLock_SITL.h
+++ b/libraries/AP_IRLock/AP_IRLock_SITL.h
@@ -16,10 +16,10 @@ public:
     AP_IRLock_SITL();
 
     // init - initialize sensor library
-    virtual void init(int8_t bus);
+    void init(int8_t bus) override;
 
     // retrieve latest sensor data - returns true if new data is available
-    virtual bool update();
+    bool update() override;
 
 private: