diff --git a/src/engine_func.h b/src/engine_func.h
--- a/src/engine_func.h
+++ b/src/engine_func.h
@@ -19,9 +19,6 @@ void DrawRoadVehEngine(int x, int y, Eng
 void DrawShipEngine(int x, int y, EngineID engine, SpriteID pal);
 void DrawAircraftEngine(int x, int y, EngineID engine, SpriteID pal);
 
-void LoadCustomEngineNames();
-void DeleteCustomEngineNames();
-
 bool IsEngineBuildable(EngineID engine, VehicleType type, CompanyID company);
 bool IsEngineRefittable(EngineID engine);
 CargoID GetEngineCargoType(EngineID engine);