diff --git a/hw/scsi-disk.c b/hw/scsi-disk.c
index 50fc3d6eaa541b176e970d23611ff70ae801c7e7..6b139acda1901442fe9fc0940626d04f5cbcebdb 100644
--- a/hw/scsi-disk.c
+++ b/hw/scsi-disk.c
@@ -1180,6 +1180,9 @@ static int scsi_disk_emulate_command(SCSIDiskReq *r)
         if (!nb_sectors) {
             goto not_ready;
         }
+        if ((req->cmd.buf[8] & 1) == 0 && req->cmd.lba) {
+            goto illegal_request;
+        }
         nb_sectors /= s->cluster_size;
         /* Returned value is the address of the last sector.  */
         nb_sectors--;
@@ -1232,6 +1235,9 @@ static int scsi_disk_emulate_command(SCSIDiskReq *r)
             if (!nb_sectors) {
                 goto not_ready;
             }
+            if ((req->cmd.buf[14] & 1) == 0 && req->cmd.lba) {
+                goto illegal_request;
+            }
             nb_sectors /= s->cluster_size;
             /* Returned value is the address of the last sector.  */
             nb_sectors--;