@@ -24,10 +24,13 @@
  *	  OFMutableTarArchiveEntry.h ObjFW/OFMutableTarArchiveEntry.h
  *
  * @brief A class which represents a mutable entry of a tar archive.
  */
 @interface OFMutableTarArchiveEntry: OFTarArchiveEntry
+{
+	OF_RESERVE_IVARS(4)
+}
 
 /*!
  * @brief The file name of the entry.
  */
 @property (readwrite, copy, nonatomic) OFString *fileName;