diff --git a/msg.go b/msg.go
index be62a1e..cf6fd52 100644
--- a/msg.go
+++ b/msg.go
@@ -24,8 +24,8 @@ func NewMessageCenter(host, clientKey, clientSecret, serverIndex, tempIndex stri
 		},
 	}
 	msg.header = map[string]string{"content-type": "application/json; charset=utf-8"}
-	accessToken, err := msg.getAccessToken()
-	msg.header = map[string]string{"Authorization": accessToken, "content-type": "application/json; charset=utf-8"}
+	token, err := msg.getAccessToken()
+	msg.header = map[string]string{"Authorization": token, "content-type": "application/json; charset=utf-8"}
 
 	return msg, err
 }