1 files changed, 2 insertions, 0 deletions
diff --git a/hw/virtio-blk.h b/hw/virtio-blk.h
index fff46da7db..5645d2bf3c 100644
--- a/hw/virtio-blk.h
+++ b/hw/virtio-blk.h
@@ -34,6 +34,8 @@
 #define VIRTIO_BLK_F_WCACHE     9       /* write cache enabled */
 #define VIRTIO_BLK_F_TOPOLOGY   10      /* Topology information is available */
 
+#define VIRTIO_BLK_ID_BYTES     20      /* ID string length */
+
 struct virtio_blk_config
 {
     uint64_t capacity;