@@ -24,10 +24,11 @@
 @class OFData;
 
 /*!
  * @brief An ASN.1 BitString.
  */
+OF_SUBCLASSING_RESTRICTED
 @interface OFASN1BitString: OFObject <OFASN1DERRepresentation>
 {
 	OFData *_bitStringValue;
 	size_t _bitStringLength;
 }