diff --git a/hw/virtio-scsi.c b/hw/virtio-scsi.c
index 30d3f8aca7dee770b4eb7c69a01dc995955e8ff2..7d546f6ca7c6f26a08c1c1ca2256b46601661c0b 100644
--- a/hw/virtio-scsi.c
+++ b/hw/virtio-scsi.c
@@ -204,7 +204,7 @@ static void virtio_scsi_bad_req(void)
 static void qemu_sgl_init_external(QEMUSGList *qsgl, struct iovec *sg,
                                    hwaddr *addr, int num)
 {
-    memset(qsgl, 0, sizeof(*qsgl));
+    qemu_sglist_init(qsgl, num, &dma_context_memory);
     while (num--) {
         qemu_sglist_add(qsgl, *(addr++), (sg++)->iov_len);
     }