diff --git a/fs/serve.go b/fs/serve.go
index de9eb26c..a4c80a59 100644
--- a/fs/serve.go
+++ b/fs/serve.go
@@ -460,6 +460,7 @@ type Server struct {
 	meta         sync.Mutex
 	req          map[fuse.RequestID]func() // map request to cancel functions
 	node         []*serveNode
+	nodeRefLock  sync.Mutex
 	nodeRef      map[Node]fuse.NodeID
 	inode2idLock sync.Mutex
 	inode2id     map[uint64]fuse.NodeID
@@ -1716,6 +1717,8 @@ func (s *Server) getNodeId(node Node) (id fuse.NodeID, ok bool) {
 		s.inode2idLock.Unlock()
 		return
 	}
+	s.nodeRefLock.Lock()
+	defer s.nodeRefLock.Unlock()
 	id, ok = s.nodeRef[node]
 	return
 }
@@ -1726,6 +1729,8 @@ func (s *Server) setNodeId(node Node, id fuse.NodeID) {
 		s.inode2idLock.Unlock()
 		return
 	}
+	s.nodeRefLock.Lock()
+	defer s.nodeRefLock.Unlock()
 	s.nodeRef[node] = id
 }
 func (s *Server) delNodeId(node Node) {
@@ -1735,6 +1740,8 @@ func (s *Server) delNodeId(node Node) {
 		s.inode2idLock.Unlock()
 		return
 	}
+	s.nodeRefLock.Lock()
+	defer s.nodeRefLock.Unlock()
 	delete(s.nodeRef, node)
 }