diff --git a/usr/fileio/common.c b/usr/fileio/common.c
index 32f633b19..fc257ea04 100644
--- a/usr/fileio/common.c
+++ b/usr/fileio/common.c
@@ -354,6 +354,7 @@ static int do_exec(struct vdisk_cmd *vcmd)
 		lba_start |= ((uint64_t)cdb[3]) << 48;
 		lba_start |= ((uint64_t)cdb[4]) << 40;
 		lba_start |= ((uint64_t)cdb[5]) << 32;
+		lba_start |= ((uint64_t)cdb[6]) << 24;
 		lba_start |= ((uint64_t)cdb[6]) << 16;
 		lba_start |= ((uint64_t)cdb[7]) << 8;
 		lba_start |= ((uint64_t)cdb[8]);