diff --git a/src/sl/animated_tile_sl.cpp b/src/sl/animated_tile_sl.cpp
index b0eaca342d..cdbf7650c7 100644
--- a/src/sl/animated_tile_sl.cpp
+++ b/src/sl/animated_tile_sl.cpp
@@ -22,8 +22,8 @@ struct AnimatedTileStructHandler : public SaveLoadStructHandler {
 	NamedSaveLoadTable GetDescription() const override
 	{
 		static const NamedSaveLoad _anim_tiles_sub_desc[] = {
-			NSLT("tile",     SLTAG(SLTAG_CUSTOM_START,     SLE_VAR(AnimatedTilePair, first, SLE_UINT32))),
-			NSLT("speed",    SLTAG(SLTAG_CUSTOM_START + 1, SLE_VAR(AnimatedTilePair, second.speed, SLE_UINT8))),
+			NSLT("tile",     SLTAG(SLTAG_CUSTOM_0, SLE_VAR(AnimatedTilePair, first, SLE_UINT32))),
+			NSLT("speed",    SLTAG(SLTAG_CUSTOM_1, SLE_VAR(AnimatedTilePair, second.speed, SLE_UINT8))),
 		};
 		return _anim_tiles_sub_desc;
 	}
@@ -45,7 +45,7 @@ struct AnimatedTileStructHandler : public SaveLoadStructHandler {
 	void Load([[maybe_unused]] void *object) const override
 	{
 		auto slt = this->GetLoadDescription();
-		if (slt.size() != 2 || slt[0].label_tag != SLTAG_CUSTOM_START || slt[1].label_tag != SLTAG_CUSTOM_START + 1) {
+		if (slt.size() != 2 || slt[0].label_tag != SLTAG_CUSTOM_0 || slt[1].label_tag != SLTAG_CUSTOM_1) {
 			SlErrorCorrupt("Table format ANIT chunk fields not as expected");
 		}
 
diff --git a/src/sl/order_sl.cpp b/src/sl/order_sl.cpp
index 355f09cc08..2db1481833 100644
--- a/src/sl/order_sl.cpp
+++ b/src/sl/order_sl.cpp
@@ -313,8 +313,8 @@ using DispatchSupplementaryNamePair = std::pair<const uint32_t, std::string>;
 NamedSaveLoadTable GetDispatchSupplementaryNamePairDescription()
 {
 	static const NamedSaveLoad _dispatch_name_pair_desc[] = {
-		NSL("key",           SLTAG(SLTAG_CUSTOM_START,      SLE_VAR(DispatchSupplementaryNamePair, first,                                       SLE_UINT32))),
-		NSL("value",         SLTAG(SLTAG_CUSTOM_START + 1, SLE_SSTR(DispatchSupplementaryNamePair, second,                                      SLE_STR))),
+		NSL("key",           SLTAG(SLTAG_CUSTOM_0,  SLE_VAR(DispatchSupplementaryNamePair, first,                                       SLE_UINT32))),
+		NSL("value",         SLTAG(SLTAG_CUSTOM_1, SLE_SSTR(DispatchSupplementaryNamePair, second,                                      SLE_STR))),
 	};
 
 	return _dispatch_name_pair_desc;
@@ -338,7 +338,7 @@ struct DispatchNameStructHandler final : public TypedSaveLoadStructHandler<Dispa
 	void Load(DispatchSchedule *ds) const override
 	{
 		SaveLoadTable slt = this->GetLoadDescription();
-		if (slt.size() != 2 || slt[0].label_tag != SLTAG_CUSTOM_START || slt[1].label_tag != SLTAG_CUSTOM_START + 1) {
+		if (slt.size() != 2 || slt[0].label_tag != SLTAG_CUSTOM_0 || slt[1].label_tag != SLTAG_CUSTOM_1) {
 			SlErrorCorrupt("Dispatch names sub-chunk fields not as expected");
 		}
 
diff --git a/src/sl/saveload_types.h b/src/sl/saveload_types.h
index ca4ccf02f0..cab457fb1a 100644
--- a/src/sl/saveload_types.h
+++ b/src/sl/saveload_types.h
@@ -160,6 +160,8 @@ enum SaveLoadTags {
 	SLTAG_DEFAULT,
 	SLTAG_TABLE_UNKNOWN,
 	SLTAG_CUSTOM_START,
+	SLTAG_CUSTOM_0 = SLTAG_CUSTOM_START,
+	SLTAG_CUSTOM_1,
 };
 
 enum NamedSaveLoadFlags : uint8_t {