diff --git a/vhost_user_backend/src/lib.rs b/vhost_user_backend/src/lib.rs
index fb2d6fcc5..6de50798d 100644
--- a/vhost_user_backend/src/lib.rs
+++ b/vhost_user_backend/src/lib.rs
@@ -64,9 +64,12 @@ pub trait VhostUserBackend: Send + Sync + 'static {
     /// Depth of each queue.
     fn max_queue_size(&self) -> usize;
 
-    /// Virtio features.
+    /// Available virtio features.
     fn features(&self) -> u64;
 
+    /// Acked virtio features.
+    fn acked_features(&mut self, _features: u64) {}
+
     /// Virtio protocol features.
     fn protocol_features(&self) -> VhostUserProtocolFeatures;
 
@@ -577,6 +580,11 @@ impl<S: VhostUserBackend> VhostUserSlaveReqHandler for VhostUserHandler<S> {
             vring.write().unwrap().enabled = vring_enabled;
         }
 
+        self.backend
+            .write()
+            .unwrap()
+            .acked_features(self.acked_features);
+
         Ok(())
     }