diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index c568821b8463..c1d0713666ee 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -1170,7 +1170,7 @@ submit:
 
 		atomic_inc(&dcc->issued_discard);
 
-		f2fs_update_iostat(sbi, NULL, FS_DISCARD, 1);
+		f2fs_update_iostat(sbi, NULL, FS_DISCARD, len * F2FS_BLKSIZE);
 
 		lstart += len;
 		start += len;