diff --git a/src/Attribute/Obj/ObjectClass.php b/src/Attribute/Obj/ObjectClass.php
index b5fc5bc..528bd79 100644
--- a/src/Attribute/Obj/ObjectClass.php
+++ b/src/Attribute/Obj/ObjectClass.php
@@ -2,7 +2,7 @@
 
 namespace Ulmus\Ldap\Attribute\Obj;
 
-#[\Attribute]
+#[\Attribute(\Attribute::TARGET_CLASS)]
 class ObjectClass {
 
     public string $type;
diff --git a/src/Attribute/Obj/ObjectType.php b/src/Attribute/Obj/ObjectType.php
index a86b8ed..aee0a69 100644
--- a/src/Attribute/Obj/ObjectType.php
+++ b/src/Attribute/Obj/ObjectType.php
@@ -2,7 +2,7 @@
 
 namespace Ulmus\Ldap\Attribute\Obj;
 
-#[\Attribute]
+#[\Attribute(\Attribute::TARGET_CLASS)]
 class ObjectType {
 
     public string $type;