diff --git a/src/Internal/Schema/SingleCastUnionToType.php b/src/Internal/Schema/SingleCastUnionToType.php
index d365073..453907a 100644
--- a/src/Internal/Schema/SingleCastUnionToType.php
+++ b/src/Internal/Schema/SingleCastUnionToType.php
@@ -150,7 +150,7 @@ public static function generate(BuilderFactory $builderFactory, string $pathPref
                                                             'hydrateObject',
                                                             [
                                                                 $builderFactory->classConstFetch(
-                                                                    $classString->relative,
+                                                                    $classString->fullyQualified->source,
                                                                     'class',
                                                                 ),
                                                                 $builderFactory->var('value'),
diff --git a/src/Internal/UnionTypeUtils.php b/src/Internal/UnionTypeUtils.php
index d373d96..42b1275 100644
--- a/src/Internal/UnionTypeUtils.php
+++ b/src/Internal/UnionTypeUtils.php
@@ -26,7 +26,7 @@ public static function buildUnionType(Representation\Namespaced\Property\Type $t
                     'string' => $typeInUnion->payload,
                     'array' => 'array',
                     'object' => match ($typeInUnion->payload::class) {
-                        Representation\Namespaced\Schema::class => $typeInUnion->payload->className->relative,
+                        Representation\Namespaced\Schema::class => $typeInUnion->payload->className->fullyQualified->source,
                         Representation\Namespaced\Property\Type::class => self::buildUnionType($typeInUnion->payload),
                     },
                 };