diff --git a/src/saveload/vehicle_sl.cpp b/src/saveload/vehicle_sl.cpp
index 059015be29..453210baaa 100644
--- a/src/saveload/vehicle_sl.cpp
+++ b/src/saveload/vehicle_sl.cpp
@@ -839,8 +839,10 @@ const SaveLoad *GetVehicleDescription(VehicleType vt)
 		 SLE_CONDVAR(Vehicle, age,                   SLE_INT32,                   31, SL_MAX_VERSION),
 		     SLE_VAR(Vehicle, tick_counter,          SLE_UINT8),
 
-		     SLE_VAR(DisasterVehicle, image_override,            SLE_UINT16),
-		     SLE_VAR(DisasterVehicle, big_ufo_destroyer_target,  SLE_UINT16),
+		 SLE_CONDVAR(DisasterVehicle, image_override,            SLE_FILE_U16 | SLE_VAR_U32,   0, 190),
+		 SLE_CONDVAR(DisasterVehicle, image_override,            SLE_UINT32,                 191, SL_MAX_VERSION),
+		 SLE_CONDVAR(DisasterVehicle, big_ufo_destroyer_target,  SLE_FILE_U16 | SLE_VAR_U32,   0, 190),
+		 SLE_CONDVAR(DisasterVehicle, big_ufo_destroyer_target,  SLE_UINT32,                 191, SL_MAX_VERSION),
 
 		SLE_CONDNULL(16,                                                           2, 143), // old reserved space