diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c
index d0bb92c..ee9c67d 100644
--- a/block/scsi_ioctl.c
+++ b/block/scsi_ioctl.c
@@ -60,7 +60,7 @@
 
 static int sg_get_timeout(struct request_queue *q)
 {
-	return q->sg_timeout / (HZ / USER_HZ);
+	return jiffies_to_clock_t(q->sg_timeout);
 }
 
 static int sg_set_timeout(struct request_queue *q, int __user *p)
@@ -68,7 +68,7 @@
 	int timeout, err = get_user(timeout, p);
 
 	if (!err)
-		q->sg_timeout = timeout * (HZ / USER_HZ);
+		q->sg_timeout = clock_t_to_jiffies(timeout);
 
 	return err;
 }