diff --git a/rules/TypeDeclaration/TypeAnalyzer/ObjectTypeComparator.php b/rules/TypeDeclaration/TypeAnalyzer/ObjectTypeComparator.php
index d31a90b15076..4314cb878d51 100644
--- a/rules/TypeDeclaration/TypeAnalyzer/ObjectTypeComparator.php
+++ b/rules/TypeDeclaration/TypeAnalyzer/ObjectTypeComparator.php
@@ -37,7 +37,7 @@ public function isCurrentObjectTypeSubType(Type $currentType, Type $newType): bo
             return false;
         }
 
-        return is_a($currentType->getClassName(), $newType->getClassName(), true);
+        return $newType->isSuperTypeOf($currentType)->yes();
     }
 
     private function isClosure(Type $type): bool