diff --git a/src/vnet/devices/virtio/pci.h b/src/vnet/devices/virtio/pci.h
index 0cada61..2b23377 100644
--- a/src/vnet/devices/virtio/pci.h
+++ b/src/vnet/devices/virtio/pci.h
@@ -245,6 +245,7 @@
   u64 features;
   u8 gso_enabled;
   u8 checksum_offload_enabled;
+  u32 tx_queue_size;
   virtio_bind_t bind;
   u32 buffering_size;
   u32 virtio_flags;