diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index 5acc6c4..fa2eec8 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -2609,13 +2609,13 @@ static void do_cciss_request(request_queue_t *q)
 		} else {
 			c->Request.CDBLen = 16;
 			c->Request.CDB[1]= 0;
-			c->Request.CDB[2]= (start_blk >> 56) & 0xff;	//MSB
-			c->Request.CDB[3]= (start_blk >> 48) & 0xff;
-			c->Request.CDB[4]= (start_blk >> 40) & 0xff;
-			c->Request.CDB[5]= (start_blk >> 32) & 0xff;
-			c->Request.CDB[6]= (start_blk >> 24) & 0xff;
-			c->Request.CDB[7]= (start_blk >> 16) & 0xff;
-			c->Request.CDB[8]= (start_blk >>  8) & 0xff;
+			c->Request.CDB[2]= ((u64)start_blk >> 56) & 0xff;	//MSB
+			c->Request.CDB[3]= ((u64)start_blk >> 48) & 0xff;
+			c->Request.CDB[4]= ((u64)start_blk >> 40) & 0xff;
+			c->Request.CDB[5]= ((u64)start_blk >> 32) & 0xff;
+			c->Request.CDB[6]= ((u64)start_blk >> 24) & 0xff;
+			c->Request.CDB[7]= ((u64)start_blk >> 16) & 0xff;
+			c->Request.CDB[8]= ((u64)start_blk >>  8) & 0xff;
 			c->Request.CDB[9]= start_blk & 0xff;
 			c->Request.CDB[10]= (creq->nr_sectors >>  24) & 0xff;
 			c->Request.CDB[11]= (creq->nr_sectors >>  16) & 0xff;