diff --git a/pkg/discoveryregistry/zookeeper/discover.go b/pkg/discoveryregistry/zookeeper/discover.go
index 8a5d1a9b8..610c125e8 100644
--- a/pkg/discoveryregistry/zookeeper/discover.go
+++ b/pkg/discoveryregistry/zookeeper/discover.go
@@ -74,7 +74,7 @@ func (s *ZkClient) GetConnsRemote(serviceName string) (conns []resolver.Address,
 func (s *ZkClient) GetConns(ctx context.Context, serviceName string, opts ...grpc.DialOption) ([]*grpc.ClientConn, error) {
 	s.logger.Printf("get conns from client, serviceName: %s", serviceName)
 	s.lock.Lock()
-	// defer s.lock.Unlock()
+	defer s.lock.Unlock()
 	opts = append(s.options, opts...)
 	conns := s.localConns[serviceName]
 	if len(conns) == 0 {