diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 0d3b70d..0eb4aff 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -1908,7 +1908,9 @@
 	sector_t sdist;
 	u64 total;
 
-	if (cic->last_request_pos < rq->sector)
+	if (!cic->last_request_pos)
+		sdist = 0;
+	else if (cic->last_request_pos < rq->sector)
 		sdist = rq->sector - cic->last_request_pos;
 	else
 		sdist = cic->last_request_pos - rq->sector;