@@ -20,14 +20,15 @@
 OF_ASSUME_NONNULL_BEGIN
 
 @class OFMapTable;
 @class OFMapTableEnumerator;
 
+OF_SUBCLASSING_RESTRICTED
 @interface OFMapTableDictionary: OFDictionary
 {
 	OFMapTable *_mapTable;
 }
 
 - (instancetype)initWithCapacity: (size_t)capacity;
 @end
 
 OF_ASSUME_NONNULL_END