diff --git a/B3WeChat/Rpcs/WeChatUserRpc.cs b/B3WeChat/Rpcs/WeChatUserRpc.cs
index 95db329..f2bf983 100644
--- a/B3WeChat/Rpcs/WeChatUserRpc.cs
+++ b/B3WeChat/Rpcs/WeChatUserRpc.cs
@@ -88,7 +88,7 @@ namespace BWP.B3WeChat.Rpcs
     }
 
 
-    [Rpc]
+    [Rpc(RpcFlags.SkipAuth)]
     public static string GetJsApiSignature(string noncestr, string timestamp, string url)
     {
       return InOutMessageUtil.GetJsApiSignature(noncestr, timestamp, url);