@@ -114,10 +114,11 @@
 /*!
  * @class OFNumber OFNumber.h ObjFW/OFNumber.h
  *
  * @brief Provides a way to store a number in an object.
  */
+OF_SUBCLASSING_RESTRICTED
 @interface OFNumber: OFValue <OFComparing, OFSerialization,
     OFJSONRepresentation, OFMessagePackRepresentation>
 {
 	union of_number_value {
 		bool		   bool_;