diff --git a/src/saveload/vehicle_sl.cpp b/src/saveload/vehicle_sl.cpp
--- a/src/saveload/vehicle_sl.cpp
+++ b/src/saveload/vehicle_sl.cpp
@@ -526,8 +526,7 @@ const SaveLoad *GetVehicleDescription(Ve
 		 SLE_CONDVAR(Vehicle, current_order_time,    SLE_UINT32,                  67, SL_MAX_VERSION),
 		 SLE_CONDVAR(Vehicle, lateness_counter,      SLE_INT32,                   67, SL_MAX_VERSION),
 
-		/* reserve extra space in savegame here. (currently 10 bytes) */
-		SLE_CONDNULL(10,                                                           2, SL_MAX_VERSION),
+		SLE_CONDNULL(10,                                                           2, 143), // old reserved space
 
 		     SLE_END()
 	};
@@ -549,8 +548,7 @@ const SaveLoad *GetVehicleDescription(Ve
 
 		SLE_CONDNULL(2, 2, 19),
 		 SLE_CONDVAR(Train, gv_flags,            SLE_UINT16,                 139, SL_MAX_VERSION),
-		/* reserve extra space in savegame here. (currently 11 bytes) */
-		SLE_CONDNULL(11, 2, SL_MAX_VERSION),
+		SLE_CONDNULL(11, 2, 143), // old reserved space
 
 		     SLE_END()
 	};
@@ -570,8 +568,7 @@ const SaveLoad *GetVehicleDescription(Ve
 		 SLE_CONDVAR(RoadVehicle, gv_flags,             SLE_UINT16,                 139, SL_MAX_VERSION),
 		SLE_CONDNULL(4,                                                              69, 130),
 		SLE_CONDNULL(2,                                                               6, 130),
-		/* reserve extra space in savegame here. (currently 16 bytes) */
-		SLE_CONDNULL(16,                                                              2, SL_MAX_VERSION),
+		SLE_CONDNULL(16,                                                              2, 143), // old reserved space
 
 		     SLE_END()
 	};
@@ -581,8 +578,7 @@ const SaveLoad *GetVehicleDescription(Ve
 		SLE_VEH_INCLUDE(),
 		     SLE_VAR(Ship, state, SLE_UINT8),
 
-		/* reserve extra space in savegame here. (currently 16 bytes) */
-		SLE_CONDNULL(16, 2, SL_MAX_VERSION),
+		SLE_CONDNULL(16, 2, 143), // old reserved space
 
 		     SLE_END()
 	};
@@ -604,8 +600,7 @@ const SaveLoad *GetVehicleDescription(Ve
 
 		 SLE_CONDVAR(Aircraft, turn_counter,          SLE_UINT8,                  136, SL_MAX_VERSION),
 
-		/* reserve extra space in savegame here. (currently 13 bytes) */
-		SLE_CONDNULL(13,                                                           2, SL_MAX_VERSION),
+		SLE_CONDNULL(13,                                                           2, 143), // old reserved space
 
 		     SLE_END()
 	};
@@ -634,8 +629,7 @@ const SaveLoad *GetVehicleDescription(Ve
 
 		 SLE_CONDVAR(Vehicle, spritenum,             SLE_UINT8,                    2, SL_MAX_VERSION),
 
-		/* reserve extra space in savegame here. (currently 15 bytes) */
-		SLE_CONDNULL(15,                                                           2, SL_MAX_VERSION),
+		SLE_CONDNULL(15,                                                           2, 143), // old reserved space
 
 		     SLE_END()
 	};
@@ -672,8 +666,7 @@ const SaveLoad *GetVehicleDescription(Ve
 		     SLE_VAR(DisasterVehicle, image_override,            SLE_UINT16),
 		     SLE_VAR(DisasterVehicle, big_ufo_destroyer_target,  SLE_UINT16),
 
-		/* reserve extra space in savegame here. (currently 16 bytes) */
-		SLE_CONDNULL(16,                                                           2, SL_MAX_VERSION),
+		SLE_CONDNULL(16,                                                           2, 143), // old reserved space
 
 		     SLE_END()
 	};