diff --git a/src/vehicle_base.h b/src/vehicle_base.h
--- a/src/vehicle_base.h
+++ b/src/vehicle_base.h
@@ -703,6 +703,7 @@ public:
 	}
 
 	bool IsEngineCountable() const;
+	bool HasEngineType() const;
 	bool HasDepotOrder() const;
 	void HandlePathfindingResult(bool path_found);