diff --git a/drivers/md/bitmap.h b/drivers/md/bitmap.h
index 67c7f77..4aabc74 100644
--- a/drivers/md/bitmap.h
+++ b/drivers/md/bitmap.h
@@ -262,6 +262,8 @@
 
 int bitmap_resize(struct bitmap *bitmap, sector_t blocks,
 		  int chunksize, int init);
+int bitmap_copy_from_slot(struct mddev *mddev, int slot,
+				sector_t *lo, sector_t *hi);
 #endif
 
 #endif