diff --git a/libraries/SITL/SIM_Submarine.h b/libraries/SITL/SIM_Submarine.h
index 83d1ed3c64..fecd6b1d6f 100644
--- a/libraries/SITL/SIM_Submarine.h
+++ b/libraries/SITL/SIM_Submarine.h
@@ -34,7 +34,7 @@ public:
     Submarine(const char *home_str, const char *frame_str);
 
     /* update model by one time step */
-    void update(const struct sitl_input &input);
+    void update(const struct sitl_input &input) override;
 
     /* static object creator */
     static Aircraft *create(const char *home_str, const char *frame_str) {