diff --git a/grpc.go b/grpc.go
index a582269..969ffbc 100644
--- a/grpc.go
+++ b/grpc.go
@@ -758,8 +758,8 @@ func (g *grpcServer) Register() error {
 	}
 	g.RUnlock()
 
-	service.Metadata["protocol"] = "grpc"
-	service.Metadata["transport"] = "grpc"
+	service.Nodes[0].Metadata["protocol"] = "grpc"
+	service.Nodes[0].Metadata["transport"] = "grpc"
 	service.Endpoints = endpoints
 
 	g.RLock()