@@ -54,10 +54,14 @@
  *	 and makes it work together with the caching of OFStream. If you
  *	 override this methods without the `lowlevel` prefix, you *will* break
  *	 caching, get broken results and seek to the wrong position!
  */
 @interface OFSeekableStream: OFStream
+{
+	OF_RESERVE_IVARS(4)
+}
+
 /*!
  * @brief Seeks to the specified absolute offset.
  *
  * @param offset The offset in bytes
  * @param whence From where to seek.@n