@@ -24,10 +24,11 @@
 @class OFNumber;
 
 /*!
  * @brief An ASN.1 ObjectIdentifier.
  */
+OF_SUBCLASSING_RESTRICTED
 @interface OFASN1ObjectIdentifier: OFObject
 {
 	OFArray OF_GENERIC(OFNumber *) *_subidentifiers;
 }