diff --git a/third_party/vmm_vhost/src/connection/vfio.rs b/third_party/vmm_vhost/src/connection/vfio.rs
index 48eaea1bc4..bc2b5d6c20 100644
--- a/third_party/vmm_vhost/src/connection/vfio.rs
+++ b/third_party/vmm_vhost/src/connection/vfio.rs
@@ -88,7 +88,8 @@ impl<D: Device> ListenerTrait for Listener<D> {
     }
 
     fn set_nonblocking(&self, _block: bool) -> Result<()> {
-        unimplemented!("set_nonblocking");
+        // `accept` will never block on a VFIO connection.
+        Ok(())
     }
 }