diff --git a/common/redisclient.go b/common/redisclient.go
index b51152f..ec528e6 100644
--- a/common/redisclient.go
+++ b/common/redisclient.go
@@ -8,6 +8,7 @@ import (
 	"bufio"
 	"fmt"
 	"net"
+	"strconv"
 )
 
 type RedisClient struct {
@@ -34,8 +35,13 @@ func (client *RedisClient) writeArray(size int) (err error) {
 	return
 }
 
+func redisLength(prefix byte, s int) []byte {
+	buf := append(make([]byte, 0, 16), prefix)
+	return append(strconv.AppendInt(buf, int64(s), 10), '\r', '\n')
+}
+
 func (client *RedisClient) writeBulkString(data []byte) (err error) {
-	if _, err = client.conn.Write([]byte(fmt.Sprintf("$%d\r\n", len(data)))); err != nil {
+	if _, err = client.conn.Write(redisLength('$', len(data))); err != nil {
 		return
 	}
 	if _, err = client.conn.Write(data); err != nil {