diff --git a/IoTSharp.Extensions.RESTful/SystemTextJsonRestClientExtensions.cs b/IoTSharp.Extensions.RESTful/SystemTextJsonRestClientExtensions.cs
index 336cbc811..e2a74e213 100644
--- a/IoTSharp.Extensions.RESTful/SystemTextJsonRestClientExtensions.cs
+++ b/IoTSharp.Extensions.RESTful/SystemTextJsonRestClientExtensions.cs
@@ -38,7 +38,7 @@ public static async Task<T> GetDataBy<T>(this Uri uri, Action<RestRequest> actio
         {
             return await GetDataBy<T>(uri, action, false);
         }
-        public static async Task<T> GetDataBy<T>(this Uri uri, Action<RestRequest> action, bool checktype = false)
+        public static async Task<T> GetDataBy<T>(this Uri uri, Action<RestRequest> action, bool checktype )
         {
             var result1 = default(T);
             var client = Create(uri);