diff --git a/alioth-cli/src/vu.rs b/alioth-cli/src/vu.rs
index 79b7f555..72226e0a 100644
--- a/alioth-cli/src/vu.rs
+++ b/alioth-cli/src/vu.rs
@@ -16,7 +16,6 @@ use std::marker::PhantomData;
 use std::os::unix::net::UnixListener;
 use std::path::Path;
 use std::sync::Arc;
-use std::thread::spawn;
 
 use alioth::errors::{DebugTrace, trace_error};
 use alioth::mem::mapped::RamBus;
@@ -142,7 +141,7 @@ pub fn start(args: VuArgs) -> Result<(), Error> {
         }?;
         let (conn, _) = listener.accept().context(error::Accept)?;
         let backend = VuBackend::new(conn, dev, memory).context(error::CreateVu)?;
-        spawn(move || run_backend(backend));
+        run_backend(backend);
         index = index.wrapping_add(1);
     }
 }
diff --git a/alioth/src/virtio/vu/backend.rs b/alioth/src/virtio/vu/backend.rs
index 7f916b2a..0a5c744f 100644
--- a/alioth/src/virtio/vu/backend.rs
+++ b/alioth/src/virtio/vu/backend.rs
@@ -283,7 +283,7 @@ impl VuBackend {
             }
             (VuFrontMsg::GET_FEATURES, 0) => {
                 let feature = self.dev.device_feature | VirtioFeature::VHOST_PROTOCOL.bits();
-                self.session.reply(req, &feature, &[])?;
+                self.session.reply(req, &(feature as u64), &[])?;
                 msg.flag.set_need_reply(false);
                 log::debug!("{name}: get device feature: {feature:#x}");
             }