@@ -27,10 +27,11 @@
 /*!
  * @class OFTarArchive OFTarArchive.h ObjFW/OFTarArchive.h
  *
  * @brief A class for accessing and manipulating tar archives.
  */
+OF_SUBCLASSING_RESTRICTED
 @interface OFTarArchive: OFObject
 {
 	OFStream *_stream;
 	enum {
 		OF_TAR_ARCHIVE_MODE_READ,