diff --git a/block/parallels.h b/block/parallels.h
index 4e53e95..6b19944 100644
--- a/block/parallels.h
+++ b/block/parallels.h
@@ -72,6 +72,9 @@
     unsigned long *bat_dirty_bmap;
     unsigned int  bat_dirty_block;
 
+    unsigned long *used_bmap;
+    unsigned long used_bmap_size;
+
     uint32_t *bat_bitmap;
     unsigned int bat_size;