diff --git a/src/Ast/PhpDocTypeParser.php b/src/Ast/PhpDocTypeParser.php
index d289b4a..668a268 100644
--- a/src/Ast/PhpDocTypeParser.php
+++ b/src/Ast/PhpDocTypeParser.php
@@ -13,6 +13,7 @@
 use PHPStan\PhpDocParser\Ast\Type\ArrayTypeNode;
 use PHPStan\PhpDocParser\Ast\Type\GenericTypeNode;
 use PHPStan\PhpDocParser\Ast\Type\IdentifierTypeNode;
+use PHPStan\PhpDocParser\Ast\Type\NullableTypeNode;
 use PHPStan\PhpDocParser\Ast\Type\TypeNode;
 use PHPStan\PhpDocParser\Ast\Type\UnionTypeNode;
 use PHPStan\PhpDocParser\Lexer\Lexer;
@@ -22,6 +23,7 @@
 use PHPStan\PhpDocParser\Parser\TypeParser;
 use Riverwaysoft\PhpConverter\Dto\DtoClassProperty;
 use Riverwaysoft\PhpConverter\Dto\PhpType\PhpListType;
+use Riverwaysoft\PhpConverter\Dto\PhpType\PhpOptionalType;
 use Riverwaysoft\PhpConverter\Dto\PhpType\PhpTypeFactory;
 use Riverwaysoft\PhpConverter\Dto\PhpType\PhpTypeInterface;
 use Riverwaysoft\PhpConverter\Dto\PhpType\PhpUnionType;
@@ -144,6 +146,9 @@ private function convertToDto(TypeNode $node): PhpTypeInterface|null
         if ($node instanceof UnionTypeNode) {
             return new PhpUnionType(array_map(fn (TypeNode $child) => $this->convertToDto($child), $node->types));
         }
+        if ($node instanceof NullableTypeNode) {
+            return new PhpOptionalType($this->convertToDto($node->type));
+        }
         if ($node instanceof GenericTypeNode) {
             return PhpTypeFactory::create($node->type->name, array_map(
                 fn (TypeNode $child) => $this->convertToDto($child),
diff --git a/tests/Ast/PhpDocTypeParserTest.php b/tests/Ast/PhpDocTypeParserTest.php
index 0a60514..0fd7bef 100644
--- a/tests/Ast/PhpDocTypeParserTest.php
+++ b/tests/Ast/PhpDocTypeParserTest.php
@@ -10,6 +10,7 @@
 use Riverwaysoft\PhpConverter\Dto\DtoClassProperty;
 use Riverwaysoft\PhpConverter\Dto\PhpType\PhpBaseType;
 use Riverwaysoft\PhpConverter\Dto\PhpType\PhpListType;
+use Riverwaysoft\PhpConverter\Dto\PhpType\PhpOptionalType;
 use Riverwaysoft\PhpConverter\Dto\PhpType\PhpTypeInterface;
 use Riverwaysoft\PhpConverter\Dto\PhpType\PhpUnionType;
 use Riverwaysoft\PhpConverter\Dto\PhpType\PhpUnknownType;
@@ -112,6 +113,15 @@ public static function getDataVarAndReturn(): array
                     PhpBaseType::null(),
                 ]),
             ],
+            [
+                'nullable optional string array',
+                '/** @var ?string[] */',
+                new PhpOptionalType(
+                    new PhpListType(
+                        PhpBaseType::string(),
+                    ),
+                ),
+            ],
             [
                 '2d array',
                 '/** @var int[][] */',