diff --git a/src/Properties/ModelCastHelper.php b/src/Properties/ModelCastHelper.php
index 74fac3058..62d08d6b8 100644
--- a/src/Properties/ModelCastHelper.php
+++ b/src/Properties/ModelCastHelper.php
@@ -21,6 +21,7 @@
 use PHPStan\Type\StringType;
 use PHPStan\Type\Type;
 use PHPStan\Type\TypeCombinator;
+use PHPStan\Type\TypeWithClassName;
 
 class ModelCastHelper
 {
@@ -112,7 +113,7 @@ public function getWriteableType(string $cast, Type $originalType): Type
             $methodReflection = $classReflection->getNativeMethod('castUsing');
             $castUsingReturn = ParametersAcceptorSelector::selectSingle($methodReflection->getVariants())->getReturnType();
 
-            if ($castUsingReturn instanceof ObjectType && $castReflection = $castUsingReturn->getClassReflection()) {
+            if ($castUsingReturn instanceof TypeWithClassName && $castReflection = $castUsingReturn->getClassReflection()) {
                 $classReflection = $castReflection;
             }
         }