diff --git a/src/saveload/misc_sl.cpp b/src/saveload/misc_sl.cpp
index 4415d67d67..0f389246e2 100644
--- a/src/saveload/misc_sl.cpp
+++ b/src/saveload/misc_sl.cpp
@@ -67,7 +67,7 @@ static const SaveLoadGlobVarList _date_desc[] = {
 	SLEG_CONDVAR(_date,                   SLE_INT32,                  31, SL_MAX_VERSION),
 	    SLEG_VAR(_date_fract,             SLE_UINT16),
 	    SLEG_VAR(_tick_counter,           SLE_UINT16),
-	    SLEG_VAR(_vehicle_id_ctr_day,     SLE_UINT16),
+	SLE_CONDNULL(2, 0, 156), // _vehicle_id_ctr_day
 	    SLEG_VAR(_age_cargo_skip_counter, SLE_UINT8),
 	SLE_CONDNULL(1, 0, 45),
 	SLEG_CONDVAR(_cur_tileloop_tile,      SLE_FILE_U16 | SLE_VAR_U32,  0, 5),
@@ -92,7 +92,7 @@ static const SaveLoadGlobVarList _date_check_desc[] = {
 	SLEG_CONDVAR(_load_check_data.current_date,  SLE_INT32,                  31, SL_MAX_VERSION),
 	    SLE_NULL(2),                       // _date_fract
 	    SLE_NULL(2),                       // _tick_counter
-	    SLE_NULL(2),                       // _vehicle_id_ctr_day
+	SLE_CONDNULL(2, 0, 156),               // _vehicle_id_ctr_day
 	    SLE_NULL(1),                       // _age_cargo_skip_counter
 	SLE_CONDNULL(1, 0, 45),
 	SLE_CONDNULL(2, 0, 5),                 // _cur_tileloop_tile
diff --git a/src/saveload/oldloader_sl.cpp b/src/saveload/oldloader_sl.cpp
index cdb1fff6f5..a42e6e14a8 100644
--- a/src/saveload/oldloader_sl.cpp
+++ b/src/saveload/oldloader_sl.cpp
@@ -1656,7 +1656,7 @@ static const OldChunks main_chunk[] = {
 
 	OCL_ASSERT( OC_TTO, 0x496AC ),
 
-	OCL_VAR ( OC_UINT16,    1, &_vehicle_id_ctr_day ),
+	OCL_NULL ( 2 ), // _vehicle_id_ctr_day
 
 	OCL_CHUNK(  8, LoadOldSubsidy ),
 
diff --git a/src/vehicle.cpp b/src/vehicle.cpp
index 8777ea1be6..f5bffc1591 100644
--- a/src/vehicle.cpp
+++ b/src/vehicle.cpp
@@ -58,7 +58,6 @@
 
 #define GEN_HASH(x, y) ((GB((y), 6, 6) << 6) + GB((x), 7, 6))
 
-VehicleID _vehicle_id_ctr_day;
 VehicleID _new_vehicle_id;
 uint16 _returned_refit_capacity;      ///< Stores the capacity after a refit operation.
 uint16 _returned_mail_refit_capacity; ///< Stores the mail capacity after a refit operation (Aircraft only).
diff --git a/src/vehicle_func.h b/src/vehicle_func.h
index 0015a42959..2f43d7d029 100644
--- a/src/vehicle_func.h
+++ b/src/vehicle_func.h
@@ -172,7 +172,6 @@ CommandCost EnsureNoVehicleOnGround(TileIndex tile);
 CommandCost EnsureNoTrainOnTrackBits(TileIndex tile, TrackBits track_bits);
 void StopAllVehicles();
 
-extern VehicleID _vehicle_id_ctr_day;
 extern VehicleID _new_vehicle_id;
 extern uint16 _returned_refit_capacity;
 extern uint16 _returned_mail_refit_capacity;