diff --git a/rueidisaside/aside.go b/rueidisaside/aside.go
index e9add1b4..7d71aaf3 100644
--- a/rueidisaside/aside.go
+++ b/rueidisaside/aside.go
@@ -21,6 +21,7 @@ type ClientOption struct {
 type CacheAsideClient interface {
 	Get(ctx context.Context, ttl time.Duration, key string, fn func(ctx context.Context, key string) (val string, err error)) (val string, err error)
 	Del(ctx context.Context, key string) error
+	Client() rueidis.Client
 	Close()
 }
 
@@ -177,6 +178,11 @@ func (c *Client) Del(ctx context.Context, key string) error {
 	return c.client.Do(ctx, c.client.B().Del().Key(key).Build()).Error()
 }
 
+// Client exports the underlying rueidis.Client
+func (c *Client) Client() rueidis.Client {
+	return c.client
+}
+
 func (c *Client) Close() {
 	c.cancel()
 	c.mu.Lock()
diff --git a/rueidisaside/aside_test.go b/rueidisaside/aside_test.go
index 295299ed..84c5e4de 100644
--- a/rueidisaside/aside_test.go
+++ b/rueidisaside/aside_test.go
@@ -32,16 +32,21 @@ func TestClientErr(t *testing.T) {
 }
 
 func TestWithClientBuilder(t *testing.T) {
-	client, err := NewClient(ClientOption{
+	var client rueidis.Client
+	c, err := NewClient(ClientOption{
 		ClientOption: rueidis.ClientOption{InitAddress: addr},
-		ClientBuilder: func(option rueidis.ClientOption) (rueidis.Client, error) {
-			return rueidis.NewClient(option)
+		ClientBuilder: func(option rueidis.ClientOption) (_ rueidis.Client, err error) {
+			client, err = rueidis.NewClient(option)
+			return client, err
 		},
 	})
 	if err != nil {
 		t.Fatal(err)
 	}
-	defer client.Close()
+	defer c.Close()
+	if c.Client() != client {
+		t.Fatal("client mismatched")
+	}
 }
 
 func TestCacheFilled(t *testing.T) {