diff --git a/vhost_user_block/src/lib.rs b/vhost_user_block/src/lib.rs
index 4fde1a97d..ba1753301 100644
--- a/vhost_user_block/src/lib.rs
+++ b/vhost_user_block/src/lib.rs
@@ -259,6 +259,7 @@ impl VhostUserBackend for VhostUserBlkBackend {
             | 1 << VIRTIO_BLK_F_CONFIG_WCE
             | 1 << VIRTIO_RING_F_EVENT_IDX
             | 1 << VIRTIO_F_VERSION_1
+            | 1 << VIRTIO_BLK_F_FLUSH
             | VhostUserVirtioFeatures::PROTOCOL_FEATURES.bits();
 
         if self.rdonly {