diff --git a/src/engine.cpp b/src/engine.cpp
index 94199a6022..d581248249 100644
--- a/src/engine.cpp
+++ b/src/engine.cpp
@@ -56,6 +56,8 @@ const uint8 _engine_offsets[4] = {
 	lengthof(_orig_rail_vehicle_info) + lengthof(_orig_road_vehicle_info) + lengthof(_orig_ship_vehicle_info),
 };
 
+assert_compile(lengthof(_orig_rail_vehicle_info) + lengthof(_orig_road_vehicle_info) + lengthof(_orig_ship_vehicle_info) + lengthof(_orig_aircraft_vehicle_info) == lengthof(_orig_engine_info));
+
 const uint EngineOverrideManager::NUM_DEFAULT_ENGINES = _engine_counts[VEH_TRAIN] + _engine_counts[VEH_ROAD] + _engine_counts[VEH_SHIP] + _engine_counts[VEH_AIRCRAFT];
 
 Engine::Engine() :
diff --git a/src/table/engines.h b/src/table/engines.h
index 5cfd1cf32e..321b9f41a2 100644
--- a/src/table/engines.h
+++ b/src/table/engines.h
@@ -335,6 +335,7 @@ static const EngineInfo _orig_engine_info[] = {
 	MA( 23832,  20,  20,  99,                        Y), // 252 Flashbang Wizzer
 	MA( 13575,  20,  20,  40,                  T|A|S  ), // 253 Tricario Helicopter
 	MA( 28215,  20,  20,  30,                  T|A|S  ), // 254 Guru X2 Helicopter
+	MA( 13575,  20,  20,  99,                        Y), // 255 Powernaut Helicopter
 };
 #undef Y
 #undef S