diff --git a/src/dragonball/src/dbs_virtio_devices/src/vhost/vhost_user/connection.rs b/src/dragonball/src/dbs_virtio_devices/src/vhost/vhost_user/connection.rs
index 71197dee2a..43b1a96d66 100644
--- a/src/dragonball/src/dbs_virtio_devices/src/vhost/vhost_user/connection.rs
+++ b/src/dragonball/src/dbs_virtio_devices/src/vhost/vhost_user/connection.rs
@@ -25,8 +25,6 @@ use crate::{Error as VirtioError, Result as VirtioResult};
 
 enum EndpointProtocolFlags {
     ProtocolMq = 1,
-    #[cfg(feature = "vhost-user-blk")]
-    ProtocolBackend = 2,
 }
 
 pub(super) struct Listener {