@@ -29,10 +29,11 @@
 /*!
  * @class OFZIPArchive OFZIPArchive.h ObjFW/OFZIPArchive.h
  *
  * @brief A class for accessing and manipulating ZIP files.
  */
+OF_SUBCLASSING_RESTRICTED
 @interface OFZIPArchive: OFObject
 {
 	OFStream *_stream;
 	int64_t _offset;
 	enum {