@@ -41,10 +41,11 @@
 {
 	unsigned char *_items;
 	size_t _count, _itemSize;
 	bool _freeWhenDone;
 	OFData *_parentData;
+	OF_RESERVE_IVARS(4)
 }
 
 /*!
  * @brief The size of a single item in the OFData in bytes.
  */