diff --git a/store/memory/memory.go b/store/memory/memory.go
index 4c5fb8c4..11b41046 100644
--- a/store/memory/memory.go
+++ b/store/memory/memory.go
@@ -4,7 +4,7 @@ import (
 	"context"
 	"sort"
 	"strings"
-	"sync"
+	"sync/atomic"
 	"time"
 
 	cache "github.com/patrickmn/go-cache"
@@ -40,8 +40,7 @@ type memoryStore struct {
 	funcDelete  store.FuncDelete
 	store       *cache.Cache
 	opts        store.Options
-	isConnected bool
-	mutex       sync.Mutex
+	isConnected atomic.Int32
 }
 
 func (m *memoryStore) key(prefix, key string) string {
@@ -277,8 +276,6 @@ func (m *memoryStore) fnList(ctx context.Context, opts ...store.ListOption) ([]s
 }
 
 func (m *memoryStore) connect(ctx context.Context) error {
-	m.mutex.Lock()
-	defer m.mutex.Unlock()
-	m.isConnected = true
+	m.isConnected.CompareAndSwap(0, 1)
 	return nil
 }
diff --git a/store/noop.go b/store/noop.go
index 3ca5f5f5..7b113dfa 100644
--- a/store/noop.go
+++ b/store/noop.go
@@ -2,7 +2,7 @@ package store
 
 import (
 	"context"
-	"sync"
+	"sync/atomic"
 
 	"go.unistack.org/micro/v3/options"
 )
@@ -16,8 +16,7 @@ type noopStore struct {
 	funcList    FuncList
 	funcDelete  FuncDelete
 	opts        Options
-	isConnected bool
-	mutex       sync.Mutex
+	isConnected atomic.Int32
 }
 
 func NewStore(opts ...Option) *noopStore {
@@ -173,16 +172,13 @@ func (n *noopStore) Options() Options {
 }
 
 func (n *noopStore) connect(ctx context.Context) error {
-	n.mutex.Lock()
-	defer n.mutex.Unlock()
-	if n.isConnected {
-		return nil
-	}
-	n.isConnected = true
-	select {
-	case <-ctx.Done():
-		return ctx.Err()
-	default:
+	if n.isConnected.CompareAndSwap(0, 1) {
+		select {
+		case <-ctx.Done():
+			return ctx.Err()
+		default:
+		}
 	}
+
 	return nil
 }