diff --git a/bucket.go b/bucket.go
index f18b43c..1fc7d2f 100644
--- a/bucket.go
+++ b/bucket.go
@@ -3,6 +3,7 @@ package unikv
 import (
 	"encoding/gob"
 	"fmt"
+	"reflect"
 	"strconv"
 	"strings"
 )
@@ -42,6 +43,13 @@ func (b *Bucket) List() ([]Key, error) {
 			sl[i] = NewKey(v)
 		}
 		return sl, nil
+	case []reflect.Value:
+		ksa := ks.([]reflect.Value)
+		sl := make([]Key, len(ksa))
+		for i, v := range ksa {
+			sl[i] = NewKey(v.String())
+		}
+		return sl, nil
 	}
 	return nil, fmt.Errorf("Unknown driver error")
 }
diff --git a/drivers/memory/driver.go b/drivers/memory/driver.go
index ad41643..5be181a 100644
--- a/drivers/memory/driver.go
+++ b/drivers/memory/driver.go
@@ -1,7 +1,6 @@
 package memorydriver
 
 import (
-	"reflect"
 	"sync"
 
 	"github.com/apiles/unikv"
@@ -35,7 +34,12 @@ func (d *Driver) Unset(key string) error {
 
 // List lists the keys
 func (d *Driver) List() (interface{}, error) {
-	return reflect.ValueOf(d.data).MapKeys(), nil
+	var rslt []string
+	d.data.Range(func(k, _v interface{}) bool {
+		rslt = append(rslt, k.(string))
+		return true
+	})
+	return rslt, nil
 }
 
 // Close closes driver
diff --git a/drivers/persistent-memory/driver.go b/drivers/persistent-memory/driver.go
index 90a220e..4630737 100644
--- a/drivers/persistent-memory/driver.go
+++ b/drivers/persistent-memory/driver.go
@@ -3,6 +3,7 @@ package persistentmemorydriver
 import (
 	"encoding/gob"
 	"os"
+	"reflect"
 	"sync"
 
 	"github.com/apiles/unikv"
@@ -65,6 +66,11 @@ func (d *Driver) Put(key string, value string) error {
 	return nil
 }
 
+// List lists the keys
+func (d *Driver) List() (interface{}, error) {
+	return reflect.ValueOf(d.data).MapKeys(), nil
+}
+
 // Unset unsets data
 func (d *Driver) Unset(key string) error {
 	key = unikv.ConcatPrefix(d.prefix, key)
diff --git a/drivers/redis/driver.go b/drivers/redis/driver.go
index 22998f2..42cc179 100644
--- a/drivers/redis/driver.go
+++ b/drivers/redis/driver.go
@@ -72,6 +72,26 @@ func (d *Driver) Unset(key string) error {
 	return err
 }
 
+// List lists the keys
+func (d *Driver) List() (interface{}, error) {
+	data, err := d.conn.Do("KEYS", "*")
+	if err != nil {
+		if err == redis.ErrNil {
+			return "", unikv.ErrNotFound
+		}
+		if !d.reconnected {
+			d.connect()
+			d.reconnected = true
+			return d.List()
+		}
+		return "", err
+	}
+	if d.reconnected {
+		d.reconnected = false
+	}
+	return data, err
+}
+
 // Close closes driver
 func (d *Driver) Close() error {
 	return d.conn.Close()