@@ -68,10 +68,11 @@
  * @class OFMapTable OFMapTable.h ObjFW/OFMapTable.h
  *
  * @brief A class similar to OFDictionary, but providing more options how keys
  *	  and objects should be retained, released, compared and hashed.
  */
+OF_SUBCLASSING_RESTRICTED
 @interface OFMapTable: OFObject <OFCopying, OFFastEnumeration>
 {
 	of_map_table_functions_t _keyFunctions, _objectFunctions;
 	struct of_map_table_bucket *_Nonnull *_Nullable _buckets;
 	uint32_t _count, _capacity;