diff --git a/vhost_user_block/src/lib.rs b/vhost_user_block/src/lib.rs
index 93c020097..2adef9405 100644
--- a/vhost_user_block/src/lib.rs
+++ b/vhost_user_block/src/lib.rs
@@ -58,6 +58,7 @@ impl<D: Read + Seek + Write + Send> DiskFile for D {}
 type Result<T> = std::result::Result<T, Error>;
 type VhostUserBackendResult<T> = std::result::Result<T, std::io::Error>;
 
+#[allow(dead_code)]
 #[derive(Debug)]
 enum Error {
     /// Failed to create kill eventfd