@@ -25,10 +25,13 @@
  *
  * @brief A class which represents a mutable entry in the central directory of
  *	  a ZIP archive.
  */
 @interface OFMutableZIPArchiveEntry: OFZIPArchiveEntry
+{
+	OF_RESERVE_IVARS(4)
+}
 
 /*!
  * @brief The file name of the entry.
  */
 @property (readwrite, copy, nonatomic) OFString *fileName;