diff --git a/block.h b/block.h
index ecf66c5..536265e 100644
--- a/block.h
+++ b/block.h
@@ -200,4 +200,5 @@
 int bdrv_get_dirty(BlockDriverState *bs, int64_t sector);
 void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector,
                       int nr_sectors);
+int64_t bdrv_get_dirty_count(BlockDriverState *bs);
 #endif