diff --git a/src/MaaWpfGui/Models/AsstTasks/AsstCopilotTask.cs b/src/MaaWpfGui/Models/AsstTasks/AsstCopilotTask.cs
index aa88294f84..18b4aab04b 100644
--- a/src/MaaWpfGui/Models/AsstTasks/AsstCopilotTask.cs
+++ b/src/MaaWpfGui/Models/AsstTasks/AsstCopilotTask.cs
@@ -12,6 +12,7 @@
 // </copyright>
 #nullable enable
 using System.Collections.Generic;
+using System.Linq;
 using MaaWpfGui.Services;
 using Newtonsoft.Json;
 using Newtonsoft.Json.Linq;
@@ -85,7 +86,7 @@ public class AsstCopilotTask : AsstBaseTask
 
         if (UserAdditionals?.Count > 0)
         {
-            taskParams["user_additional"] = JsonConvert.SerializeObject(UserAdditionals);
+            taskParams["user_additional"] = new JArray(UserAdditionals.Select(JObject.FromObject));
         }
 
         if (NeedNavigate)