diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
index 2e09f162c42f01b6ac39f3689eae208f5d4b75b1..0947f2e200456c2136e8d7520164dda4636fa203 100644
--- a/arch/um/drivers/ubd_kern.c
+++ b/arch/um/drivers/ubd_kern.c
@@ -1083,7 +1083,7 @@ static void do_ubd_request(request_queue_t *q)
 {
 	struct io_thread_req *io_req;
 	struct request *req;
-	int n;
+	int n, last_sectors;
 
 	while(1){
 		struct ubd *dev = q->queuedata;
@@ -1099,9 +1099,11 @@ static void do_ubd_request(request_queue_t *q)
 		}
 
 		req = dev->request;
+		last_sectors = 0;
 		while(dev->start_sg < dev->end_sg){
 			struct scatterlist *sg = &dev->sg[dev->start_sg];
 
+			req->sector += last_sectors;
 			io_req = kmalloc(sizeof(struct io_thread_req),
 					 GFP_ATOMIC);
 			if(io_req == NULL){
@@ -1113,6 +1115,7 @@ static void do_ubd_request(request_queue_t *q)
 					(unsigned long long) req->sector << 9,
 					sg->offset, sg->length, sg->page);
 
+			last_sectors = sg->length >> 9;
 			n = os_write_file(thread_fd, &io_req,
 					  sizeof(struct io_thread_req *));
 			if(n != sizeof(struct io_thread_req *)){
@@ -1124,7 +1127,6 @@ static void do_ubd_request(request_queue_t *q)
 				return;
 			}
 
-			req->sector += sg->length >> 9;
 			dev->start_sg++;
 		}
 		dev->end_sg = 0;