diff --git a/src/Type/ObjectType.php b/src/Type/ObjectType.php
index f9e8e8c3d3..1e6fa4b06c 100644
--- a/src/Type/ObjectType.php
+++ b/src/Type/ObjectType.php
@@ -25,7 +25,7 @@ class ObjectType implements TypeWithClassName, SubtractableType
 	use TruthyBooleanTypeTrait;
 	use NonGenericTypeTrait;
 
-	private const EXTRA_OFFSET_CLASSES = ['SimpleXMLElement', 'DOMNodeList'];
+	private const EXTRA_OFFSET_CLASSES = ['SimpleXMLElement', 'DOMNodeList', 'Threaded'];
 
 	/** @var string */
 	private $className;