diff --git a/register/context_test.go b/register/context_test.go
index b7eff604..614a0b08 100644
--- a/register/context_test.go
+++ b/register/context_test.go
@@ -2,7 +2,6 @@ package register
 
 import (
 	"context"
-	"go.unistack.org/micro/v4/register/memory"
 	"testing"
 )
 
@@ -16,7 +15,7 @@ func TestFromNilContext(t *testing.T) {
 
 func TestNewNilContext(t *testing.T) {
 	// nolint: staticcheck
-	ctx := NewContext(nil, memory.NewRegister())
+	ctx := NewContext(nil, NewRegister())
 
 	c, ok := FromContext(ctx)
 	if c == nil || !ok {
@@ -25,7 +24,7 @@ func TestNewNilContext(t *testing.T) {
 }
 
 func TestFromContext(t *testing.T) {
-	ctx := context.WithValue(context.TODO(), registerKey{}, memory.NewRegister())
+	ctx := context.WithValue(context.TODO(), registerKey{}, NewRegister())
 
 	c, ok := FromContext(ctx)
 	if c == nil || !ok {
@@ -34,7 +33,7 @@ func TestFromContext(t *testing.T) {
 }
 
 func TestNewContext(t *testing.T) {
-	ctx := NewContext(context.TODO(), memory.NewRegister())
+	ctx := NewContext(context.TODO(), NewRegister())
 
 	c, ok := FromContext(ctx)
 	if c == nil || !ok {
diff --git a/register/noop.go b/register/noop.go
index e1587b13..4fb692d3 100644
--- a/register/noop.go
+++ b/register/noop.go
@@ -36,23 +36,19 @@ func (n *noop) Disconnect(ctx context.Context) error {
 }
 
 func (n *noop) Register(ctx context.Context, service *Service, option ...RegisterOption) error {
-	//TODO implement me
-	panic("implement me")
+	return nil
 }
 
 func (n *noop) Deregister(ctx context.Context, service *Service, option ...DeregisterOption) error {
-	//TODO implement me
-	panic("implement me")
+	return nil
 }
 
 func (n *noop) LookupService(ctx context.Context, s string, option ...LookupOption) ([]*Service, error) {
-	//TODO implement me
-	panic("implement me")
+	return nil, nil
 }
 
 func (n *noop) ListServices(ctx context.Context, option ...ListOption) ([]*Service, error) {
-	//TODO implement me
-	panic("implement me")
+	return nil, nil
 }
 
 func (n *noop) Watch(ctx context.Context, opts ...WatchOption) (Watcher, error) {
@@ -70,8 +66,7 @@ type watcher struct {
 }
 
 func (m *watcher) Next() (*Result, error) {
-	//TODO implement me
-	panic("implement me")
+	return nil, nil
 }
 
 func (m *watcher) Stop() {}
diff --git a/register/register.go b/register/register.go
index e2b98d10..c06ccc9f 100644
--- a/register/register.go
+++ b/register/register.go
@@ -4,13 +4,9 @@ package register // import "go.unistack.org/micro/v4/register"
 import (
 	"context"
 	"errors"
-	"go.unistack.org/micro/v4/register/memory"
-
 	"go.unistack.org/micro/v4/metadata"
 )
 
-// TODO we have cycle import!!!!!
-
 const (
 	// WildcardDomain indicates any domain
 	WildcardDomain = "*"
@@ -21,7 +17,7 @@ var DefaultDomain = "micro"
 
 var (
 	// DefaultRegister is the global default register
-	DefaultRegister = memory.NewRegister()
+	DefaultRegister = NewRegister()
 	// ErrNotFound returned when LookupService is called and no services found
 	ErrNotFound = errors.New("service not found")
 	// ErrWatcherStopped returned when when watcher is stopped