@@ -229,10 +229,13 @@
  * @class OFMapTableEnumerator OFMapTable.h ObjFW/OFMapTable.h
  *
  * @brief A class which provides methods to enumerate through an OFMapTable's
  *	  keys or objects.
  */
+#ifndef OF_MAP_TABLE_M
+OF_SUBCLASSING_RESTRICTED
+#endif
 @interface OFMapTableEnumerator: OFObject
 {
 	OFMapTable *_mapTable;
 	struct OFMapTableBucket *_Nonnull *_Nullable _buckets;
 	uint32_t _capacity;