diff --git a/src/data/bedrock/block/upgrade/BlockStateUpgradeSchemaFlattenedName.php b/src/data/bedrock/block/upgrade/BlockStateUpgradeSchemaFlattenedName.php
index e2f7f798d..8259f690d 100644
--- a/src/data/bedrock/block/upgrade/BlockStateUpgradeSchemaFlattenedName.php
+++ b/src/data/bedrock/block/upgrade/BlockStateUpgradeSchemaFlattenedName.php
@@ -34,7 +34,7 @@ final class BlockStateUpgradeSchemaFlattenedName{
 	/**
 	 * @param string[] $flattenedValueRemaps
 	 * @phpstan-param array<string, string> $flattenedValueRemaps
-	 * @phpstan-param class-string<ByteTag>|class-string<IntTag>|class-string<StringTag>|null $flattenedPropertyType
+	 * @phpstan-param ?class-string<ByteTag|IntTag|StringTag> $flattenedPropertyType
 	 */
 	public function __construct(
 		public string $prefix,
diff --git a/tools/generate-blockstate-upgrade-schema.php b/tools/generate-blockstate-upgrade-schema.php
index d2d0a8c41..43bcc71f1 100644
--- a/tools/generate-blockstate-upgrade-schema.php
+++ b/tools/generate-blockstate-upgrade-schema.php
@@ -318,7 +318,7 @@ function findCommonSuffix(array $strings) : string{
  * @param string[][][] $candidateFlattenedValues
  * @phpstan-param array<string, array<string, array<string, string>>> $candidateFlattenedValues
  * @param string[] $candidateFlattenPropertyTypes
- * @phpstan-param array<string, class-string<ByteTag>|class-string<IntTag>|class-string<StringTag>> $candidateFlattenPropertyTypes
+ * @phpstan-param array<string, class-string<ByteTag|IntTag|StringTag>> $candidateFlattenPropertyTypes
  *
  * @return BlockStateUpgradeSchemaFlattenedName[][]
  * @phpstan-return array<string, array<string, BlockStateUpgradeSchemaFlattenedName>>