diff --git a/libraries/AP_IRLock/AP_IRLock_I2C.h b/libraries/AP_IRLock/AP_IRLock_I2C.h
index 1262eaefc1b781..862274beb3d398 100644
--- a/libraries/AP_IRLock/AP_IRLock_I2C.h
+++ b/libraries/AP_IRLock/AP_IRLock_I2C.h
@@ -13,7 +13,7 @@ class AP_IRLock_I2C : public IRLock
     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 9f59c99a79e31f..caac3d64bd33e7 100644
--- a/libraries/AP_IRLock/AP_IRLock_SITL.h
+++ b/libraries/AP_IRLock/AP_IRLock_SITL.h
@@ -16,10 +16,10 @@ class AP_IRLock_SITL : public IRLock
     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: