diff --git a/src/saveload/vehicle_sl.cpp b/src/saveload/vehicle_sl.cpp
index 2b504c7aa8..59ada7eb15 100644
--- a/src/saveload/vehicle_sl.cpp
+++ b/src/saveload/vehicle_sl.cpp
@@ -805,6 +805,7 @@ const SaveLoad *GetVehicleDescription(VehicleType vt)
 		 SLE_CONDVAR(Aircraft, previous_pos,          SLE_UINT8,                    2, SL_MAX_VERSION),
 		 SLE_CONDVAR(Aircraft, last_direction,        SLE_UINT8,                    2, SL_MAX_VERSION),
 		 SLE_CONDVAR(Aircraft, number_consecutive_turns, SLE_UINT8,                 2, SL_MAX_VERSION),
+		 SLE_CONDNULL_X(2, 0, SL_MAX_VERSION, SlXvFeatureTest(XSLFTO_AND, XSLFI_SPRINGPP)),
 
 		 SLE_CONDVAR(Aircraft, turn_counter,          SLE_UINT8,                  136, SL_MAX_VERSION),
 		 SLE_CONDVAR(Aircraft, flags,                 SLE_UINT8,                  167, SL_MAX_VERSION),